diff --git a/MainWindow.IedBrowser.RcbFocusedRead.cs b/MainWindow.IedBrowser.RcbFocusedRead.cs
index db79dbc64..a60177322 100644
--- a/MainWindow.IedBrowser.RcbFocusedRead.cs
+++ b/MainWindow.IedBrowser.RcbFocusedRead.cs
@@ -64,7 +64,8 @@ await _runtime.ReadBrowserValuesAsync(
                     device.LiveValues.PublishForAssociation(association,
                         result.Target.Reference, result.Target.FunctionalConstraint,
                         scalar, result.Quality, result.DeviceTimestamp, "MMS Read",
-                        result.UtcTimeEvidence, result.QualityEvidence);
+                        result.UtcTimeEvidence, result.QualityEvidence,
+                        typedBoolean: result.TypedBoolean);
                 });
                 _iedBrowserLastLiveVersion = -1;
                 RefreshIedBrowserVisibleValues();
diff --git a/MainWindow.IedBrowser.cs b/MainWindow.IedBrowser.cs
index 1af8c3598..c1d3a1d49 100644
--- a/MainWindow.IedBrowser.cs
+++ b/MainWindow.IedBrowser.cs
@@ -30,6 +30,10 @@ public partial class MainWindow
     private bool? _iedBrowserRenderedConnected;
     private bool _iedBrowserForceRefresh;
     private Iec61850MonitorDevice? _iedBrowserCachedDevice;
+    private long _iedBrowserCachedAssociation = -1;
+    // UI freshness fence only: a monitor/RCB state transition invalidates
+    // previous RptEna display proof without modifying the live-value ledger.
+    private DateTime _iedBrowserRcbEnabledMinReadUtc = DateTime.MinValue;
     private LiveIedModelDiscoveryDocument? _iedBrowserCachedModel;
     private IedBrowserSchemaIndex? _iedBrowserValueSchemaIndex;
     // Immutable EnumType declarations, never a second live-value store.
@@ -570,7 +574,8 @@ void DrainReadResults()
                     readAssociation, result.Target.Reference,
                     result.Target.FunctionalConstraint, safeValue,
                     result.Quality, result.DeviceTimestamp, "MMS Read",
-                    result.UtcTimeEvidence, result.QualityEvidence);
+                    result.UtcTimeEvidence, result.QualityEvidence,
+                    typedBoolean: result.TypedBoolean);
                 if (!accepted) return;
                 _iedBrowserReadFailureEvidence?.ClearFailure(result.Target);
                 successes++;
@@ -916,6 +921,36 @@ private bool TryGetBrowserReadFailure(
         return false;
     }
 
+    private void RefreshIedBrowserRcbEnabledIndicators(Iec61850MonitorDevice device)
+    {
+        // One model identity index per coalesced flush; no full-IED MMS probe,
+        // duplicate live state store or per-RCB model inventory scan.
+        var targets = IedBrowserRcbEnabledPresentation.VerifiedTargets(
+            device.LiveDiscoveryModel);
+        var connected = device.IsConnected && !device.LiveValues.IsOffline;
+
+        // Right list objects can be visible while left LD/LN folders stay lazy.
+        foreach (var detail in _iedBrowserDetails.Rows)
+        {
+            if (detail.NavigateTo is not IedBrowserTreeRow node ||
+                node.Payload is not RcbExportRow rcb)
+                continue;
+            var verified = IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+                device.LiveValues, rcb, targets, connected, out var tooltip,
+                _iedBrowserRcbEnabledMinReadUtc);
+            if (node.SetRcbEnabled(verified, tooltip))
+                detail.RefreshRcbUsage();
+        }
+        foreach (var node in _iedBrowserTree.Rows)
+        {
+            if (node.Payload is not RcbExportRow rcb) continue;
+            var verified = IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+                device.LiveValues, rcb, targets, connected, out var tooltip,
+                _iedBrowserRcbEnabledMinReadUtc);
+            node.SetRcbEnabled(verified, tooltip);
+        }
+    }
+
     private void RefreshIedBrowserVisibleValues()
     {
         if (MainTabs.SelectedIndex != IedBrowserWorkspaceIndex ||
@@ -933,12 +968,19 @@ private void RefreshIedBrowserVisibleValues()
             : 0;
         if (usageChanges > 0)
         {
+            // Runtime ownership changes are not fresh Boolean read-back.
+            _iedBrowserRcbEnabledMinReadUtc = DateTime.UtcNow;
             foreach (var treeRow in _iedBrowserTree.Rows)
                 treeRow.RefreshRcbUsage();
             foreach (var detailRow in _iedBrowserDetails.Rows)
                 detailRow.RefreshRcbUsage();
         }
         var version = device.LiveValues.Version;
+        // RptEna is current-association MMS Read evidence, never RCB occupancy.
+        // Update only current virtual rows when source authority changes.
+        if (usageChanges > 0 || _iedBrowserLastLiveVersion != version ||
+            !ReferenceEquals(_iedBrowserLastCfCanonicalModel, device.LiveCanonicalModel))
+            RefreshIedBrowserRcbEnabledIndicators(device);
         if (_iedBrowserLastLiveVersion == version &&
             ReferenceEquals(_iedBrowserLastCfCanonicalModel, device.LiveCanonicalModel))
         {
@@ -1699,6 +1741,7 @@ private void ObserveIedBrowserDevice(Iec61850MonitorDevice? device)
         _iedBrowserFilesLoading = false;
         _iedBrowserFileCatalog = null;
         _iedBrowserObservedDevice = device;
+        _iedBrowserRcbEnabledMinReadUtc = DateTime.MinValue;
         _iedBrowserSnapshot = null;
         _iedBrowserSnapshotLease = null;
         _iedBrowserFileOwner = device;
@@ -1724,7 +1767,10 @@ or nameof(Iec61850MonitorDevice.IsMonitoring)))
         if (!ReferenceEquals(sender, _iedBrowserObservedDevice))
             return;
         if (e.PropertyName is nameof(Iec61850MonitorDevice.IsMonitoring))
+        {
             _iedBrowserForceRefresh = true;
+            _iedBrowserRcbEnabledMinReadUtc = DateTime.UtcNow;
+        }
 
         // A disconnected/replaced association can never supply "live" inspector values.
         if (_iedBrowserObservedDevice?.IsConnected != true)
@@ -1871,6 +1917,7 @@ private void RefreshIedBrowser()
         if (device == null)
         {
             _iedBrowserCachedDevice = null;
+            _iedBrowserCachedAssociation = -1;
             _iedBrowserRenderedPage = null;
             _iedBrowserRenderedConnected = null;
             _iedBrowserNavigation.SelectFromTree(null);
@@ -1913,6 +1960,7 @@ private void RefreshIedBrowser()
 
         var changed = _iedBrowserForceRefresh ||
                       !ReferenceEquals(device, _iedBrowserCachedDevice) ||
+                      device.LiveValues.Association != _iedBrowserCachedAssociation ||
                       !ReferenceEquals(model, _iedBrowserCachedModel) ||
                       !ReferenceEquals(_iedBrowserSnapshot, _iedBrowserCachedSnapshot) ||
                       !string.Equals(sourcePath, _iedBrowserCachedSourcePath, StringComparison.Ordinal) ||
@@ -1920,7 +1968,9 @@ private void RefreshIedBrowser()
         if (changed)
         {
             _iedBrowserForceRefresh = false;
-            var sameDevice = ReferenceEquals(device, _iedBrowserCachedDevice);
+            var sameDevice = ReferenceEquals(device, _iedBrowserCachedDevice) &&
+                             device.LiveValues.Association == _iedBrowserCachedAssociation &&
+                             ReferenceEquals(model, _iedBrowserCachedModel);
             var priorKey = sameDevice
                 ? (IedBrowserTreeGrid.SelectedItem as IedBrowserTreeRow)?.Key
                 : null;
@@ -1954,6 +2004,7 @@ private void RefreshIedBrowser()
                 device.IsConnected && device.IsMonitoring);
             _iedBrowserCachedRcbRows = rcbs;
             _iedBrowserCachedDevice = device;
+            _iedBrowserCachedAssociation = device.LiveValues.Association;
             _iedBrowserCachedModel = model;
             _iedBrowserCachedSnapshot = _iedBrowserSnapshot;
             _iedBrowserCachedSourcePath = sourcePath;
@@ -1963,23 +2014,9 @@ private void RefreshIedBrowser()
                 _iedBrowserRemoteFiles, EffectiveSclIedName(device),
                 device.SclWorkspace?.DesignModel);
             _iedBrowserTree.Reset(roots, expandedKeys);
-            // Reports is the familiar entry point; selecting the category shows its
-            // full RCB list on the right. Preserve explicit expansion on same-IED refresh.
-            if (!sameDevice)
-            {
-                var reports = roots.FirstOrDefault(r => r.Key == "category/reports");
-                if (reports is not null)
-                {
-                    _iedBrowserTree.Expand(reports);
-                    var ld = reports.GetChildren().FirstOrDefault();
-                    if (ld is not null)
-                    {
-                        _iedBrowserTree.Expand(ld);
-                        var ln = ld.GetChildren().FirstOrDefault();
-                        if (ln is not null) _iedBrowserTree.Expand(ln);
-                    }
-                }
-            }
+            // Fresh IED/association/model epoch: all six Objects categories
+            // remain collapsed. Selecting Reports fills the right pane
+            // without materializing left LD/LN/RCB descendants.
 
             IedBrowserTreeGrid.ItemsSource = _iedBrowserTree.Rows;
             var selected = priorKey == null ? null : _iedBrowserTree.FindVisible(priorKey);
diff --git a/MainWindow.xaml b/MainWindow.xaml
index 26f881fe5..cb5a4ab52 100644
--- a/MainWindow.xaml
+++ b/MainWindow.xaml
@@ -11,6 +11,8 @@
         TextOptions.TextHintingMode="Fixed"
         Icon="Assets/app-icon.ico" Closing="Window_Closing" PreviewKeyDown="MainWindow_PreviewKeyDown">
     <Window.Resources>
+        <!-- Exact operator-supplied circular unlocked-padlock vector; no font glyph. -->
+        <Geometry x:Key="BrowserRcbEnabledIconGeometry">M380-320h200q25 0 42.5-17.5T640-380v-120q0-25-17.5-42.5T580-560v-60q0-42-29-71t-71-29q-42 0-71 29t-29 71h60q0-17 11.5-28.5T480-660q17 0 28.5 11.5T520-620v60H380q-25 0-42.5 17.5T320-500v120q0 25 17.5 42.5T380-320ZM480-80q-83 0-156-31.5T197-197q-54-54-85.5-127T80-480q0-83 31.5-156T197-763q54-54 127-85.5T480-880q83 0 156 31.5T763-763q54 54 85.5 127T880-480q0 83-31.5 156T197-197q-54 54-127 85.5T480-80Zm0-80q134 0 227-93t93-227q0-134-93-227t-227-93q-134 0-227 93t-93 227q0 134 93 227t227 93Zm0-320Z</Geometry>
         <!-- Preserve compact columns; hover reveals the complete list of
              distinct active RCB names when more than one reports a signal. -->
         <Style x:Key="RcbAcquisitionTextStyle" TargetType="{x:Type TextBlock}">
@@ -1867,7 +1869,6 @@
                                     <ColumnDefinition Width="32"/>
                                     <ColumnDefinition Width="*"/>
                                     <ColumnDefinition Width="Auto"/>
-                                    <ColumnDefinition Width="23"/>
                                 </Grid.ColumnDefinitions>
                                 <Border Grid.Column="0" Background="{Binding GlyphBrush}" CornerRadius="2"
                                         Height="16" Width="23" VerticalAlignment="Center">
@@ -1896,10 +1897,37 @@
                                 <TextBlock Grid.Column="2" Text="{Binding Value}" ToolTip="{Binding Value}"
                                            FontSize="10.5" Foreground="#63768A" Margin="10,0,0,0"
                                            TextTrimming="CharacterEllipsis" VerticalAlignment="Center"/>
-                                <TextBlock Grid.Column="3" Text="{Binding RcbUsageGlyph}"
-                                           Foreground="#B98506" FontSize="13"
-                                           ToolTip="{Binding RcbUsageTooltip}"
-                                           HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                            </Grid>
+                        </Border>
+                    </DataTemplate>
+                    <!-- Only RCB rows have a compact fixed name/icon slot. -->
+                    <DataTemplate x:Key="BrowserRcbObjectRow">
+                        <Border MinHeight="23" BorderBrush="#E0E7EF" BorderThickness="0,0,0,1"
+                                Background="Transparent">
+                            <Grid Margin="7,1,7,1">
+                                <Grid.ColumnDefinitions>
+                                    <ColumnDefinition Width="32"/>
+                                    <ColumnDefinition Width="200"/>
+                                    <ColumnDefinition Width="24"/>
+                                    <ColumnDefinition Width="*"/>
+                                </Grid.ColumnDefinitions>
+                                <Border Grid.Column="0" Background="{Binding GlyphBrush}"
+                                        CornerRadius="2" Height="16" Width="23"
+                                        VerticalAlignment="Center">
+                                    <TextBlock Text="{Binding Glyph}" FontSize="9"
+                                               Foreground="White" FontWeight="SemiBold"
+                                               TextAlignment="Center" VerticalAlignment="Center"/>
+                                </Border>
+                                <TextBlock Grid.Column="1" Text="{Binding Name}"
+                                           ToolTip="{Binding Name}" FontSize="11.2"
+                                           Foreground="#273C55" TextTrimming="CharacterEllipsis"
+                                           VerticalAlignment="Center"/>
+                                <Path Grid.Column="2" Data="{StaticResource BrowserRcbEnabledIconGeometry}"
+                                      Width="16" Height="16" Stretch="Uniform"
+                                      Fill="#277455" VerticalAlignment="Center"
+                                      HorizontalAlignment="Center"
+                                      Visibility="{Binding RcbEnabledVisibility}"
+                                      ToolTip="{Binding RcbEnabledTooltip}"/>
                             </Grid>
                         </Border>
                     </DataTemplate>
@@ -1922,6 +1950,9 @@
                             <DataTrigger Binding="{Binding Kind}" Value="Object">
                                 <Setter Property="ContentTemplate" Value="{StaticResource BrowserObjectRow}"/>
                             </DataTrigger>
+                            <DataTrigger Binding="{Binding NavigateTo.Kind}" Value="RCB">
+                                <Setter Property="ContentTemplate" Value="{StaticResource BrowserRcbObjectRow}"/>
+                            </DataTrigger>
                             <DataTrigger Binding="{Binding Kind}" Value="FlagGroup">
                                 <Setter Property="ContentTemplate" Value="{StaticResource BrowserFlagGroupRow}"/>
                             </DataTrigger>
@@ -2054,8 +2085,9 @@
                                                             <ColumnDefinition Width="Auto"/>
                                                             <ColumnDefinition Width="17"/>
                                                             <ColumnDefinition Width="34"/>
-                                                            <ColumnDefinition Width="*"/>
+                                                            <ColumnDefinition Width="150"/>
                                                             <ColumnDefinition Width="18"/>
+                                                            <ColumnDefinition Width="*"/>
                                                         </Grid.ColumnDefinitions>
                                                         <Border Width="{Binding IndentWidth}"/>
                                                         <Button Grid.Column="1" Tag="{Binding}" Content="{Binding ToggleGlyph}"
@@ -2071,13 +2103,15 @@
                                                                        FontSize="9" FontWeight="SemiBold"
                                                                        TextAlignment="Center" VerticalAlignment="Center"/>
                                                         </Border>
-                                                        <TextBlock Grid.Column="3" Text="{Binding Title}"
+                                                        <TextBlock Grid.Column="3" Text="{Binding Title}" ToolTip="{Binding Title}"
                                                                    TextTrimming="CharacterEllipsis"
                                                                    Foreground="#243B54" VerticalAlignment="Center"/>
-                                                        <TextBlock Grid.Column="4" Text="{Binding RcbUsageGlyph}"
-                                                                   Foreground="#B98506" FontSize="13"
-                                                                   ToolTip="{Binding RcbUsageTooltip}"
-                                                                   VerticalAlignment="Center" HorizontalAlignment="Center"/>
+                                                        <Path Grid.Column="4" Data="{StaticResource BrowserRcbEnabledIconGeometry}"
+                                                              Width="15" Height="15" Stretch="Uniform"
+                                                              Fill="#277455" VerticalAlignment="Center"
+                                                              HorizontalAlignment="Center"
+                                                              Visibility="{Binding RcbEnabledVisibility}"
+                                                              ToolTip="{Binding RcbEnabledTooltip}"/>
                                                     </Grid>
                                                 </DataTemplate>
                                             </DataGridTemplateColumn.CellTemplate>
diff --git a/Models/IedBrowserLiveValues.cs b/Models/IedBrowserLiveValues.cs
index 4463575c9..594988f85 100644
--- a/Models/IedBrowserLiveValues.cs
+++ b/Models/IedBrowserLiveValues.cs
@@ -12,7 +12,8 @@ public sealed record IedBrowserObservedValue(
     string Value, string Quality, string DeviceTimestamp, string Source, DateTime ObservedUtc,
     long Revision = 0, long Association = 0, bool IsStale = false,
     MmsQualityEvidence? QualityBits = null,
-    Iec61850UtcTimeEvidence? TimeBits = null);
+    Iec61850UtcTimeEvidence? TimeBits = null,
+    bool? TypedBoolean = null);
 
 internal sealed record IedBrowserObservationChannels(
     IedBrowserObservedValue? Report = null,
@@ -100,9 +101,10 @@ public void Publish(string reference, string fc, string? value, string? quality,
     public bool PublishForAssociation(long association, string reference, string fc,
         string? value, string? quality, string? timestamp, string source,
         Iec61850UtcTimeEvidence? utcTimeEvidence = null,
-        MmsQualityEvidence? qualityEvidence = null)
+        MmsQualityEvidence? qualityEvidence = null,
+        bool? typedBoolean = null)
         => TryPublish(reference, fc, value, quality, timestamp, source, association,
-            utcTimeEvidence, qualityEvidence);
+            utcTimeEvidence, qualityEvidence, typedBoolean: typedBoolean);
 
     /// <summary>
     /// Atomically attach a verified, exact-model-owned q or t Report companion
@@ -153,7 +155,8 @@ channels.Report is not { } prior ||
     private bool TryPublish(string reference, string fc, string? value, string? quality,
         string? timestamp, string source, long? expectedAssociation,
         Iec61850UtcTimeEvidence? utcTimeEvidence,
-        MmsQualityEvidence? qualityEvidence, bool onlyIfNoReport = false)
+        MmsQualityEvidence? qualityEvidence, bool onlyIfNoReport = false,
+        bool? typedBoolean = null)
     {
         if (string.IsNullOrWhiteSpace(reference) || string.IsNullOrWhiteSpace(fc) ||
             string.IsNullOrWhiteSpace(value) ||
@@ -208,7 +211,8 @@ quality is not ("Unknown" or "Pending / q not supplied" or
                         : !suppliedTimestamp ||
                           string.Equals(timestamp, previousReport?.DeviceTimestamp,
                               StringComparison.Ordinal)
-                            ? previousReport?.TimeBits : null);
+                            ? previousReport?.TimeBits : null,
+                TypedBoolean: typedBoolean);
             _values[key] = isReport
                 ? channels with { Report = observed }
                 : channels with { Read = observed };
@@ -345,5 +349,6 @@ public sealed record IedBrowserReadResult(
     IedBrowserReadTarget Target, string Value, string Quality,
     string DeviceTimestamp, string Error,
     Iec61850UtcTimeEvidence? UtcTimeEvidence = null,
-    MmsQualityEvidence? QualityEvidence = null);
+    MmsQualityEvidence? QualityEvidence = null,
+    bool? TypedBoolean = null);
 public sealed record IedBrowserReadProgress(int Completed, int Total);
diff --git a/Models/IedBrowserPresentation.cs b/Models/IedBrowserPresentation.cs
index ee08cf3ad..a695a45b0 100644
--- a/Models/IedBrowserPresentation.cs
+++ b/Models/IedBrowserPresentation.cs
@@ -48,14 +48,27 @@ public IedBrowserTreeRow(string key, string title, string kind, int depth, objec
         ? report.Buffered ? System.Windows.Media.Brushes.SeaGreen
             : System.Windows.Media.Brushes.RoyalBlue
         : System.Windows.Media.Brushes.SteelBlue;
-    public string RcbUsageGlyph => Payload is RcbExportRow report
-        ? report.Availability switch
-        {
-            AR.Iec61850.Mms.MmsRcbOperationalAvailability.UsedByCaller => "●",
-            AR.Iec61850.Mms.MmsRcbOperationalAvailability.InUse => "◆",
-            AR.Iec61850.Mms.MmsRcbOperationalAvailability.Unknown => "?",
-            _ => ""
-        } : "";
+    // UI-only display state. This flag is re-derived from the current-IED
+    // LiveValues ledger; it is never used as an MMS/process state store.
+    private bool _rcbEnabledVerified;
+    private string _rcbEnabledTooltip = "";
+    public Visibility RcbEnabledVisibility => Payload is RcbExportRow && _rcbEnabledVerified
+        ? Visibility.Visible : Visibility.Collapsed;
+    public string RcbEnabledTooltip => _rcbEnabledTooltip;
+
+    public bool SetRcbEnabled(bool verified, string tooltip)
+    {
+        if (Payload is not RcbExportRow) return false;
+        tooltip = verified ? tooltip : "";
+        if (_rcbEnabledVerified == verified &&
+            string.Equals(_rcbEnabledTooltip, tooltip, StringComparison.Ordinal))
+            return false;
+        _rcbEnabledVerified = verified;
+        _rcbEnabledTooltip = tooltip;
+        Raise(nameof(RcbEnabledVisibility));
+        Raise(nameof(RcbEnabledTooltip));
+        return true;
+    }
     public string RcbUsageTooltip => Payload is RcbExportRow report
         ? report.Availability switch
         {
@@ -74,7 +87,6 @@ public IedBrowserTreeRow(string key, string title, string kind, int depth, objec
     public void RefreshRcbUsage()
     {
         if (Payload is not RcbExportRow) return;
-        Raise(nameof(RcbUsageGlyph));
         Raise(nameof(RcbUsageTooltip));
     }
 
@@ -263,7 +275,8 @@ public string ObservationTooltip
     public string Glyph => NavigateTo?.Glyph ?? (IsDataObject ? "DO" : Kind == "Data" ? "DA" : "");
     public System.Windows.Media.Brush GlyphBrush => NavigateTo?.GlyphBrush ??
         System.Windows.Media.Brushes.SteelBlue;
-    public string RcbUsageGlyph => NavigateTo?.RcbUsageGlyph ?? "";
+    public Visibility RcbEnabledVisibility => NavigateTo?.RcbEnabledVisibility ?? Visibility.Collapsed;
+    public string RcbEnabledTooltip => NavigateTo?.RcbEnabledTooltip ?? "";
     public string RcbUsageTooltip => NavigateTo?.RcbUsageTooltip ?? "";
 
     /// <summary>Mirror the same RCB node's active state in the right list.</summary>
@@ -271,7 +284,9 @@ public void RefreshRcbUsage()
     {
         if (NavigateTo?.Payload is not RcbExportRow rcb) return;
         PropertyChanged?.Invoke(this,
-            new PropertyChangedEventArgs(nameof(RcbUsageGlyph)));
+            new PropertyChangedEventArgs(nameof(RcbEnabledVisibility)));
+        PropertyChanged?.Invoke(this,
+            new PropertyChangedEventArgs(nameof(RcbEnabledTooltip)));
         PropertyChanged?.Invoke(this,
             new PropertyChangedEventArgs(nameof(RcbUsageTooltip)));
         if (Kind == "Object") Value = rcb.StatusText;
diff --git a/Models/IedBrowserRcbEnabledPresentation.cs b/Models/IedBrowserRcbEnabledPresentation.cs
new file mode 100644
index 000000000..ded9db63e
--- /dev/null
+++ b/Models/IedBrowserRcbEnabledPresentation.cs
@@ -0,0 +1,63 @@
+using AR.Iec61850.Discovery;
+
+namespace ArIED61850Tester.Models;
+
+/// <summary>
+/// Presentation-only RCB enablement proof. Occupancy, activation and received
+/// reports are deliberately not evidence that the remote RptEna Boolean is true.
+/// Read values remain owned exclusively by the per-association LiveValues ledger.
+/// </summary>
+public static class IedBrowserRcbEnabledPresentation
+{
+    // Build once per coalesced UI projection, O(number of model RCBs).
+    // Ambiguous duplicate identities are never accepted as Boolean authority.
+    public static IReadOnlyDictionary<string, IedBrowserReadTarget> VerifiedTargets(
+        LiveIedModelDiscoveryDocument? verified)
+    {
+        var targets = new Dictionary<string, IedBrowserReadTarget>(StringComparer.Ordinal);
+        if (verified is null) return targets;
+
+        foreach (var group in verified.ReportControls.GroupBy(
+                     item => IedBrowserLiveValues.CanonicalReference(item.Reference),
+                     StringComparer.Ordinal))
+        {
+            if (group.Count() != 1) continue;
+            var reference = group.Key;
+            var fc = reference.Contains(".BR.", StringComparison.Ordinal) ? "BR"
+                : reference.Contains(".RP.", StringComparison.Ordinal) ? "RP"
+                : "";
+            if (fc.Length == 0) continue;
+            targets.Add(reference, new IedBrowserReadTarget(
+                reference + ".RptEna", fc, "Boolean"));
+        }
+        return targets;
+    }
+
+    public static bool TryVerifiedTrue(IedBrowserLiveValues ledger,
+        RcbExportRow? row, IReadOnlyDictionary<string, IedBrowserReadTarget> targets,
+        bool connected, out string tooltip, DateTime minObservedUtc = default)
+    {
+        tooltip = "";
+        if (!connected || ledger.IsOffline || row is null) return false;
+        var reference = IedBrowserLiveValues.CanonicalReference(row.Reference);
+        if (!targets.TryGetValue(reference, out var target) ||
+            target.FunctionalConstraint != (row.Buffered ? "BR" : "RP") ||
+            !string.Equals(target.DataType, "Boolean", StringComparison.Ordinal) ||
+            !ledger.TryGet(target.Reference, target.FunctionalConstraint,
+                out var observed, preferReport: false) ||
+            observed.IsStale ||
+            observed.Association != ledger.Association ||
+            observed.ObservedUtc < minObservedUtc ||
+            !string.Equals(observed.Source, "MMS Read", StringComparison.Ordinal) ||
+            observed.TypedBoolean is not true ||
+            !bool.TryParse(observed.Value, out var enabled) || !enabled)
+            return false;
+
+        tooltip = "RptEna: true · verified MMS Read · " +
+            observed.ObservedUtc.ToString("yyyy-MM-dd HH:mm:ss.fff 'UTC'",
+                System.Globalization.CultureInfo.InvariantCulture) +
+            " · association " + observed.Association.ToString(
+                System.Globalization.CultureInfo.InvariantCulture);
+        return true;
+    }
+}
diff --git a/Services/Iec61850MonitorRuntime.cs b/Services/Iec61850MonitorRuntime.cs
index db6697367..ff3293671 100644
--- a/Services/Iec61850MonitorRuntime.cs
+++ b/Services/Iec61850MonitorRuntime.cs
@@ -198,7 +198,8 @@ private async Task<int> ReadBrowserValuesAsync(
                 {
                     values.Report(new IedBrowserReadResult(target, accepted,
                         rich?.Quality ?? "", rich?.DeviceTimestamp ?? "", "",
-                        rich?.UtcTimeEvidence, rich?.QualityEvidence));
+                        rich?.UtcTimeEvidence, rich?.QualityEvidence,
+                        rich?.Value is bool typed ? typed : null));
                     succeeded++;
                 }
                 else
diff --git a/Services/IedBrowserIsolatedReadService.cs b/Services/IedBrowserIsolatedReadService.cs
index 95706f2fd..fa1e2d056 100644
--- a/Services/IedBrowserIsolatedReadService.cs
+++ b/Services/IedBrowserIsolatedReadService.cs
@@ -90,7 +90,8 @@ await client.ConnectAsync(device.IpAddress, device.Port, cancellationToken)
                     {
                         values.Report(new IedBrowserReadResult(target, accepted,
                             read?.Quality ?? "", read?.DeviceTimestamp ?? "", "",
-                            read?.UtcTimeEvidence, read?.QualityEvidence));
+                            read?.UtcTimeEvidence, read?.QualityEvidence,
+                            read?.Value is bool typed ? typed : null));
                         successful++;
                     }
                     else
diff --git a/tests/ARSAS.Tests/IedBrowserPresentationTests.cs b/tests/ARSAS.Tests/IedBrowserPresentationTests.cs
index dc5a2eec3..1e3aa10f1 100644
--- a/tests/ARSAS.Tests/IedBrowserPresentationTests.cs
+++ b/tests/ARSAS.Tests/IedBrowserPresentationTests.cs
@@ -715,11 +715,14 @@ public void BufferedAndUnbufferedBadges_Differ_AndDoNotInventOccupancy()
         var b = new IedBrowserTreeRow("b", buffered.Name, "RCB", 3, buffered);
         var u = new IedBrowserTreeRow("u", unbuffered.Name, "RCB", 3, unbuffered);
         Assert.NotSame(b.GlyphBrush, u.GlyphBrush);
-        Assert.Equal("?", b.RcbUsageGlyph); // Unknown, not proven available
+        Assert.Equal(System.Windows.Visibility.Collapsed, b.RcbEnabledVisibility);
         buffered.Availability = AR.Iec61850.Mms.MmsRcbOperationalAvailability.UsedByCaller;
         unbuffered.Availability = AR.Iec61850.Mms.MmsRcbOperationalAvailability.InUse;
-        Assert.Equal("●", b.RcbUsageGlyph);
-        Assert.Equal("◆", u.RcbUsageGlyph);
+        // Distinct ownership badges are no proof that MMS RptEna was read true.
+        Assert.Equal(System.Windows.Visibility.Collapsed, b.RcbEnabledVisibility);
+        Assert.Equal(System.Windows.Visibility.Collapsed, u.RcbEnabledVisibility);
+        Assert.Contains("Active", b.RcbUsageTooltip);
+        Assert.Contains("another client", u.RcbUsageTooltip);
     }
 
     [Fact]
diff --git a/tests/ARSAS.Tests/M217DRcbAssociationAndAnalogFcParityTests.cs b/tests/ARSAS.Tests/M217DRcbAssociationAndAnalogFcParityTests.cs
index 113f31e23..2cf922275 100644
--- a/tests/ARSAS.Tests/M217DRcbAssociationAndAnalogFcParityTests.cs
+++ b/tests/ARSAS.Tests/M217DRcbAssociationAndAnalogFcParityTests.cs
@@ -160,19 +160,21 @@ public void PureMxFcdKeepsAllPhasesAndSharesOneReadReportLedger()
     }
 
     [Fact]
-    public void OccupiedRcbHasEvidenceGlyphButUnknownIsNotPaintedAsAvailable()
+    public void OccupancyCanBeExplainedWithoutInventingRemoteRptEna()
     {
         var row = new RcbExportRow { Reference = "LD/LLN0.RP.urcb01" };
         var node = new IedBrowserTreeRow("reports/rcb/" + row.Reference,
             row.Name, "RCB", 3, row);
-        Assert.Equal("?", node.RcbUsageGlyph);
+        Assert.Equal(System.Windows.Visibility.Collapsed, node.RcbEnabledVisibility);
         Assert.Contains("unknown", node.RcbUsageTooltip, StringComparison.OrdinalIgnoreCase);
         row.Availability = MmsRcbOperationalAvailability.InUse;
-        Assert.Equal("◆", node.RcbUsageGlyph);
+        Assert.Contains("another client", node.RcbUsageTooltip);
+        Assert.Equal(System.Windows.Visibility.Collapsed, node.RcbEnabledVisibility);
         row.Availability = MmsRcbOperationalAvailability.UsedByCaller;
-        Assert.Equal("●", node.RcbUsageGlyph);
+        Assert.Contains("Active", node.RcbUsageTooltip);
+        Assert.Equal(System.Windows.Visibility.Collapsed, node.RcbEnabledVisibility);
         row.Availability = MmsRcbOperationalAvailability.Available;
-        Assert.Equal("", node.RcbUsageGlyph);
+        Assert.Equal(System.Windows.Visibility.Collapsed, node.RcbEnabledVisibility);
     }
 
     [Fact]
diff --git a/tests/ARSAS.Tests/P0BrowserRcbEnabledTruthTests.cs b/tests/ARSAS.Tests/P0BrowserRcbEnabledTruthTests.cs
new file mode 100644
index 000000000..e54867e56
--- /dev/null
+++ b/tests/ARSAS.Tests/P0BrowserRcbEnabledTruthTests.cs
@@ -0,0 +1,176 @@
+using System.Windows;
+using AR.Iec61850.Discovery;
+using AR.Iec61850.Mms;
+using ArIED61850Tester.Models;
+
+namespace ARSAS.Tests;
+
+public sealed class P0BrowserRcbEnabledTruthTests
+{
+    private const string Root = "BCUGEF650/LLN0.RP.URCB_A";
+    private const string Other = "BCUGEF650/LLN0.RP.URCB_B";
+
+    private static LiveIedModelDiscoveryDocument Model(params string[] references) => new()
+    {
+        ReportControls = references.Select(reference => new LiveIedReportControlModel
+        {
+            Reference = reference,
+            Name = reference[(reference.LastIndexOf('.') + 1)..]
+        }).ToArray()
+    };
+
+    private static RcbExportRow Rcb(string reference = Root, bool buffered = false) => new()
+    {
+        Reference = reference,
+        Name = reference[(reference.LastIndexOf('.') + 1)..],
+        Buffered = buffered,
+        Availability = MmsRcbOperationalAvailability.UsedByCaller,
+        StatusText = "ARSAS active"
+    };
+
+    [Fact]
+    public void OnlyExactCurrentAssociationTypedMmsReadTrueEnablesTheIcon()
+    {
+        var ledger = new IedBrowserLiveValues();
+        var association = ledger.BeginAssociation();
+        var targets = IedBrowserRcbEnabledPresentation.VerifiedTargets(Model(Root, Other));
+        var row = Rcb();
+
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, row, targets, true, out _));
+        Assert.True(ledger.PublishForAssociation(association,
+            Root + ".RptEna", "RP", "true", "", "", "MMS Read",
+            typedBoolean: true));
+        Assert.True(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, row, targets, true, out var tooltip));
+        Assert.Contains("RptEna: true", tooltip);
+        Assert.Contains("verified MMS Read", tooltip);
+        // A formatted string without original decoded Boolean-kind proof
+        // cannot light the icon even when its text and source seem valid.
+        var untyped = new IedBrowserLiveValues();
+        var untypedAssociation = untyped.BeginAssociation();
+        Assert.True(untyped.PublishForAssociation(untypedAssociation,
+            Root + ".RptEna", "RP", "true", "", "", "MMS Read"));
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            untyped, row, targets, true, out _));
+        // Once Stop/activation changes the RCB state, an older successful
+        // read is only history; no new read-back means no live enabled icon.
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, row, targets, true, out _,
+            minObservedUtc: DateTime.UtcNow.AddSeconds(1)));
+
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, Rcb(Other), targets, true, out _));
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, row, targets, false, out _));
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, Rcb(Root, buffered: true), targets, true, out _));
+    }
+
+    [Theory]
+    [InlineData("true", "MMS Read")]
+    [InlineData("false", "MMS Read")]
+    [InlineData("1", "MMS Read")]
+    [InlineData("true", "MMS Report")]
+    [InlineData("true", "Snapshot")]
+    [InlineData("[true]", "MMS Read")]
+    public void FalseUntypedOrNonReadEvidenceHasNoIcon(string value, string source)
+    {
+        var ledger = new IedBrowserLiveValues();
+        var association = ledger.BeginAssociation();
+        var published = ledger.PublishForAssociation(association,
+            Root + ".RptEna", "RP", value, "", "", source);
+        // A rendered pseudo-array is rejected by the canonical scalar
+        // publication fence itself; it never becomes live Boolean evidence.
+        Assert.Equal(value != "[true]", published);
+
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, Rcb(), IedBrowserRcbEnabledPresentation.VerifiedTargets(Model(Root)),
+            true, out var tooltip));
+        Assert.Empty(tooltip);
+    }
+
+    [Fact]
+    public void ReconnectStopAndModelAmbiguityFailClosed()
+    {
+        var ledger = new IedBrowserLiveValues();
+        var old = ledger.BeginAssociation();
+        Assert.True(ledger.PublishForAssociation(old,
+            Root + ".RptEna", "RP", "true", "", "", "MMS Read",
+            typedBoolean: true));
+        var targets = IedBrowserRcbEnabledPresentation.VerifiedTargets(Model(Root));
+        Assert.True(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, Rcb(), targets, true, out _));
+
+        ledger.MarkOffline();
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, Rcb(), targets, true, out _));
+        ledger.BeginAssociation();
+        Assert.False(ledger.PublishForAssociation(old,
+            Root + ".RptEna", "RP", "true", "", "", "MMS Read",
+            typedBoolean: true));
+        Assert.False(IedBrowserRcbEnabledPresentation.TryVerifiedTrue(
+            ledger, Rcb(), targets, true, out _));
+
+        var ambiguous = IedBrowserRcbEnabledPresentation.VerifiedTargets(Model(Root, Root));
+        Assert.Empty(ambiguous);
+        Assert.Empty(IedBrowserRcbEnabledPresentation.VerifiedTargets(null));
+    }
+
+    [Fact]
+    public void VirtualTreeStartsWithExactlySixCollapsedCategories()
+    {
+        var rows = IedBrowserPresentation.Roots(null, [Rcb()]);
+        var tree = new IedBrowserTreeProjection();
+        tree.Reset(rows);
+        Assert.Equal(new[] { "GOOSE", "Reports", "Setting Groups", "Files",
+            "DataSets", "Data Model" }, tree.Rows.Select(x => x.Title));
+        Assert.All(tree.Rows, x => Assert.False(x.IsExpanded));
+
+        var reports = Assert.Single(tree.Rows.Where(x => x.Key == "category/reports"));
+        tree.Expand(reports);
+        Assert.True(reports.IsExpanded);
+        var expanded = tree.ExpandedKeys();
+        tree.Reset(IedBrowserPresentation.Roots(null, [Rcb()]), expanded);
+        Assert.True(tree.FindVisible("category/reports")?.IsExpanded == true);
+        tree.Reset(IedBrowserPresentation.Roots(null, [Rcb()]));
+        Assert.Equal(6, tree.Rows.Count);
+        Assert.All(tree.Rows, x => Assert.False(x.IsExpanded));
+    }
+
+    [Fact]
+    public void ExplicitBrowserReadForwardsDecodedBooleanEvidenceIntoAssociationLedger()
+    {
+        DirectoryInfo? root = new(AppContext.BaseDirectory);
+        while (root is not null && !File.Exists(Path.Combine(root.FullName, "MainWindow.IedBrowser.cs")))
+            root = root.Parent;
+        Assert.NotNull(root);
+        var source = File.ReadAllText(Path.Combine(root!.FullName, "MainWindow.IedBrowser.cs"));
+        // Regression guard: a read result with TypedBoolean=true must not be
+        // reduced to a display string before the RptEna presentation selector.
+        Assert.Matches(
+            @"LiveValues\.PublishForAssociation\([\s\S]{0,420}typedBoolean: result\.TypedBoolean",
+            source);
+    }
+
+    [Fact]
+    public void XamlUsesOriginalSingleVectorInInlineFixedRcbNameSlot()
+    {
+        DirectoryInfo? root = new(AppContext.BaseDirectory);
+        while (root is not null && !File.Exists(Path.Combine(root.FullName, "MainWindow.xaml")))
+            root = root.Parent;
+        Assert.NotNull(root);
+        var xaml = File.ReadAllText(Path.Combine(root!.FullName, "MainWindow.xaml"));
+        var start = xaml.IndexOf("<DataTemplate x:Key=\"BrowserRcbObjectRow\">",
+            StringComparison.Ordinal);
+        var end = xaml.IndexOf("</DataTemplate>", start, StringComparison.Ordinal);
+        Assert.True(start >= 0 && end > start);
+        var rcb = xaml[start..end];
+        Assert.Contains("<ColumnDefinition Width=\"200\"/>", rcb);
+        Assert.Contains("<ColumnDefinition Width=\"24\"/>", rcb);
+        Assert.Contains("Grid.Column=\"2\" Data=\"{StaticResource BrowserRcbEnabledIconGeometry}\"", rcb);
+        Assert.Contains("Visibility=\"{Binding RcbEnabledVisibility}\"", rcb);
+        Assert.DoesNotContain("RcbUsageGlyph", xaml);
+        Assert.Contains("<Geometry x:Key=\"BrowserRcbEnabledIconGeometry\">M380-320h200", xaml);
+    }
+}
diff --git a/tests/ARSAS.Tests/P0BrowserRcbLiveOwnershipReconciliationTests.cs b/tests/ARSAS.Tests/P0BrowserRcbLiveOwnershipReconciliationTests.cs
index 2b1fc90e3..d502df1bd 100644
--- a/tests/ARSAS.Tests/P0BrowserRcbLiveOwnershipReconciliationTests.cs
+++ b/tests/ARSAS.Tests/P0BrowserRcbLiveOwnershipReconciliationTests.cs
@@ -1,11 +1,13 @@
 using AR.Iec61850.Mms;
+using System.Windows;
 using ArIED61850Tester.Models;
 
 namespace ARSAS.Tests;
 
 /// <summary>
 /// Reproduces field regression: six RCBs were activated after tree construction,
-/// but their existing Explorer nodes retained '?' instead of caller-owned ●.
+/// RCB occupancy can change after the tree exists, but that cannot certify
+/// live RptEna enabled state or create a status icon.
 /// </summary>
 public sealed class P0BrowserRcbLiveOwnershipReconciliationTests
 {
@@ -24,17 +26,20 @@ public void ExistingTreeBecomesCallerOwnedWhenRuntimeActivatesAfterConstruction(
         var untouched = Rcb("BCUGEF650/LLN0.RP.URB_MX_SOGI10102");
         var node = new IedBrowserTreeRow("reports/rcb/active",
             active.Name, "RCB", 3, active);
-        Assert.Equal("?", node.RcbUsageGlyph);
+        Assert.Equal(Visibility.Collapsed, node.RcbEnabledVisibility);
         var activeRefs = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
         {
             "BCUGEF650/LLN0$RP$URB_MX_SOGI10101"
         };
         Assert.Equal(1, IedBrowserRcbLiveOwnershipPresentation.Reconcile(
             [active, untouched], activeRefs, connected: true));
-        Assert.Equal("●", node.RcbUsageGlyph);
+        // Even successfully activated caller ownership does not prove that a
+        // read-only current-association MMS RptEna value is Boolean true.
+        Assert.Equal(Visibility.Collapsed, node.RcbEnabledVisibility);
         Assert.Equal("ARSAS active", active.StatusText);
-        Assert.Equal("?", new IedBrowserTreeRow("reports/rcb/untouched",
-            untouched.Name, "RCB", 3, untouched).RcbUsageGlyph);
+        Assert.Equal(Visibility.Collapsed, new IedBrowserTreeRow(
+            "reports/rcb/untouched", untouched.Name, "RCB", 3,
+            untouched).RcbEnabledVisibility);
         Assert.Equal(0, IedBrowserRcbLiveOwnershipPresentation.Reconcile(
             [active, untouched], activeRefs, connected: true));
     }