diff --git a/desktop-app/resources/js/script.js b/desktop-app/resources/js/script.js
index ebafa41..476c336 100644
--- a/desktop-app/resources/js/script.js
+++ b/desktop-app/resources/js/script.js
@@ -1566,8 +1566,8 @@ This is a fully client-side application. Your content never leaves your browser
     if (mode === 'split') {
       // Restore preserved pane widths when entering split mode
       applyPaneWidths();
-    } else if (previousMode === 'split') {
-      // Reset pane widths when leaving split mode
+    } else {
+      // Reset inline pane widths when not in split mode
       resetPaneWidths();
     }
 
@@ -2841,7 +2841,8 @@ This is a fully client-side application. Your content never leaves your browser
       const activeEl = document.activeElement;
       const isTextControl = activeEl && (activeEl.tagName === "TEXTAREA" || activeEl.tagName === "INPUT");
       const hasSelection = window.getSelection && window.getSelection().toString().trim().length > 0;
-      if (!isTextControl && !hasSelection) {
+      const editorHasSelection = markdownEditor.selectionStart !== markdownEditor.selectionEnd;
+      if (!isTextControl && !hasSelection && !editorHasSelection) {
         e.preventDefault();
         copyMarkdownButton.click();
       }
diff --git a/script.js b/script.js
index c6370de..476c336 100644
--- a/script.js
+++ b/script.js
@@ -2841,7 +2841,8 @@ This is a fully client-side application. Your content never leaves your browser
       const activeEl = document.activeElement;
       const isTextControl = activeEl && (activeEl.tagName === "TEXTAREA" || activeEl.tagName === "INPUT");
       const hasSelection = window.getSelection && window.getSelection().toString().trim().length > 0;
-      if (!isTextControl && !hasSelection) {
+      const editorHasSelection = markdownEditor.selectionStart !== markdownEditor.selectionEnd;
+      if (!isTextControl && !hasSelection && !editorHasSelection) {
         e.preventDefault();
         copyMarkdownButton.click();
       }