diff --git a/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tabName-26748.test.tsx b/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tabName-26748.test.tsx
new file mode 100644
index 00000000000..c8e5bd1795f
--- /dev/null
+++ b/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tabName-26748.test.tsx
@@ -0,0 +1,113 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * A Tab visibility row keeps its name input across keystrokes (objectui#26748).
+ *
+ * Each row was keyed by the tab name its input edits, so every keystroke
+ * renamed the key, remounted the row, and the input lost focus after the first
+ * character: typing `showcase_app` stored `{"s":"hidden"}`.
+ *
+ * What is pinned:
+ *   - a name typed one key at a time (not pasted) into a new row keeps focus
+ *     and lands whole in `tabPermissions`, with the row's visibility;
+ *   - renaming an existing row keeps the other rows and their order;
+ *   - a name that passes through another row's name merges nothing, and the
+ *     row writes again once the name is free;
+ *   - the remove button drops only its own row.
+ *
+ * DIRECTION: with `key={tab}` restored the typed-name pin is red (focus leaves
+ * after the first key).
+ */
+
+import "@testing-library/jest-dom/vitest";
+import * as React from "react";
+import { afterEach, describe, expect, it } from "vitest";
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { PermissionAdvancedFacets } from "./PermissionAdvancedFacets";
+
+afterEach(cleanup);
+
+const t = (k: string) => k;
+
+type Draft = Record<string, unknown>;
+
+/** A stateful host, so each write re-renders the facets like the editor does. */
+function Host({
+  initial,
+  onDraft,
+}: {
+  initial: Draft;
+  onDraft: (d: Draft) => void;
+}) {
+  const [draft, setDraft] = React.useState<Draft>(initial);
+  React.useEffect(() => {
+    onDraft(draft);
+  }, [draft, onDraft]);
+  return (
+    <PermissionAdvancedFacets
+      draft={draft}
+      setDraft={setDraft}
+      writable
+      allSetNames={[]}
+      t={t}
+    />
+  );
+}
+
+function mount(tabPermissions: Record<string, string>) {
+  let latest: Draft = {};
+  render(
+    <Host
+      initial={{ tabPermissions }}
+      onDraft={(d) => {
+        latest = d;
+      }}
+    />,
+  );
+  fireEvent.click(screen.getByText("perm.tabs.title"));
+  return { tabs: () => latest.tabPermissions };
+}
+
+describe("a Tab visibility row keeps its name input across keystrokes (objectui#26748)", () => {
+  it("stores a name typed key by key into a new row, focus kept", async () => {
+    const user = userEvent.setup();
+    const { tabs } = mount({ "": "hidden" });
+    const input = screen.getByDisplayValue("");
+    await user.click(input);
+    await user.type(input, "showcase_app");
+    expect(document.activeElement).toBe(input);
+    expect(input).toHaveValue("showcase_app");
+    expect(tabs()).toEqual({ showcase_app: "hidden" });
+  });
+
+  it("renames an existing row, keeping the others in order", async () => {
+    const user = userEvent.setup();
+    const { tabs } = mount({ a_tab: "hidden", b_tab: "visible" });
+    const input = screen.getByDisplayValue("a_tab");
+    await user.type(input, "_x");
+    expect(document.activeElement).toBe(input);
+    expect(JSON.stringify(tabs())).toBe(
+      '{"a_tab_x":"hidden","b_tab":"visible"}',
+    );
+  });
+
+  it("merges nothing while the typed name is another row’s", async () => {
+    const user = userEvent.setup();
+    const { tabs } = mount({ app: "visible", "": "hidden" });
+    const input = screen.getByDisplayValue("");
+    await user.type(input, "app");
+    expect(input).toHaveValue("app");
+    expect(JSON.stringify(tabs())).toBe('{"app":"visible","ap":"hidden"}');
+    await user.type(input, "_x");
+    expect(JSON.stringify(tabs())).toBe('{"app":"visible","app_x":"hidden"}');
+    expect(screen.getByDisplayValue("app")).not.toBe(input);
+  });
+
+  it("removes only its own row", () => {
+    const { tabs } = mount({ a_tab: "hidden", b_tab: "visible" });
+    fireEvent.click(screen.getAllByLabelText("perm.tabs.remove")[0]!);
+    expect(tabs()).toEqual({ b_tab: "visible" });
+    expect(screen.getByDisplayValue("b_tab")).toBeInTheDocument();
+  });
+});
diff --git a/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tsx b/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tsx
index 1b2cc05943e..3bdfbf92438 100644
--- a/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tsx
+++ b/ui/packages/app-shell/src/views/metadata-admin/PermissionAdvancedFacets.tsx
@@ -745,18 +745,20 @@ export function PermissionAdvancedFacets({
       >
         <p className="text-xs text-muted-foreground mb-3">{t('perm.tabs.help')}</p>
         <div className="space-y-2">
-          {tabEntries.map(([tab, vis]) => (
-            <div key={tab} className="flex items-center gap-2">
-              <Input
-                value={tab}
+          {tabEntries.map(([tab, vis], row) => (
+            // objectui#26748 — keyed by position, not by the name the input
+            // edits: a rename keeps insertion order, so the row (and the
+            // input's focus) survives each keystroke.
+            <div key={row} className="flex items-center gap-2">
+              <TabNameInput
+                name={tab}
                 disabled={!writable}
-                onChange={(e) => {
-                  const nextKey = e.target.value;
+                taken={(name) => tabEntries.some(([k], j) => j !== row && k === name)}
+                onRename={(nextKey) => {
                   const next: TabPerms = {};
                   for (const [k, v] of tabEntries) next[k === tab ? nextKey : k] = v;
                   setTabs(next);
                 }}
-                className="h-8 w-64"
               />
               <FacetPicker
                 testId={`tab-visibility-${tab}`}
@@ -935,3 +937,37 @@ export function PermissionAdvancedFacets({
 }
 
 export default PermissionAdvancedFacets;
+
+/**
+ * objectui#26748 — a Tab visibility row's name input. It holds what is typed
+ * and writes the rename only while the name is no other row's: a name that
+ * passes through (or ends at) another row's would otherwise merge the two
+ * rows in `tabPermissions` and drop one.
+ */
+function TabNameInput({
+  name,
+  disabled,
+  taken,
+  onRename,
+}: {
+  name: string;
+  disabled: boolean;
+  taken: (name: string) => boolean;
+  onRename: (name: string) => void;
+}) {
+  const [text, setText] = React.useState(name);
+  React.useEffect(() => setText(name), [name]);
+  return (
+    <Input
+      value={text}
+      disabled={disabled}
+      aria-invalid={text !== name || undefined}
+      onChange={(e) => {
+        const next = e.target.value;
+        setText(next);
+        if (next !== name && !taken(next)) onRename(next);
+      }}
+      className="h-8 w-64"
+    />
+  );
+}