diff --git a/src-mdviewer/src/bridge.js b/src-mdviewer/src/bridge.js
index ee35477ca..dfd25b292 100644
--- a/src-mdviewer/src/bridge.js
+++ b/src-mdviewer/src/bridge.js
@@ -537,6 +537,15 @@ export function initBridge() {
 
     // Cursor sync toggle
     on("toggle:cursorSync", ({ enabled }) => {
+        // Clear any existing highlights when cursor sync is disabled
+        if (!enabled) {
+            const viewer = document.getElementById("viewer-content");
+            if (viewer) {
+                _removeCursorHighlight(viewer);
+            }
+            _lastHighlightSourceLine = null;
+            _lastHighlightTargetLine = null;
+        }
         sendToParent("mdviewrCursorSyncToggle", { enabled });
     });
 
diff --git a/src-mdviewer/src/components/editor.js b/src-mdviewer/src/components/editor.js
index ea7cb2260..e07f73b85 100644
--- a/src-mdviewer/src/components/editor.js
+++ b/src-mdviewer/src/components/editor.js
@@ -1566,7 +1566,7 @@ export function convertToMarkdown(contentEl) {
 
 // Debounced content change emitter for bridge
 let contentChangeTimer = null;
-const CONTENT_CHANGE_DEBOUNCE = 300;
+const CONTENT_CHANGE_DEBOUNCE = 50;
 
 /**
  * Re-compute data-source-line attributes on top-level block elements
diff --git a/src-mdviewer/src/components/embedded-toolbar.js b/src-mdviewer/src/components/embedded-toolbar.js
index 214dbfb99..aa3f01699 100644
--- a/src-mdviewer/src/components/embedded-toolbar.js
+++ b/src-mdviewer/src/components/embedded-toolbar.js
@@ -50,6 +50,12 @@ const THRESHOLD_BLOCKS = 640;  // collapse block elements + image first
 const THRESHOLD_LISTS = 590;   // then lists
 const THRESHOLD_TEXT = 590;    // finally text formatting (all dropdowns collapsed)
 
+// window.print() from inside an iframe is a no-op in WKWebView (Safari on macOS),
+// which is what Tauri uses for the Mac desktop build. Hide the button there.
+const _isMacWebKit = /Mac/.test(navigator.platform)
+    && /AppleWebKit/.test(navigator.userAgent)
+    && !/Chrome|CriOS|Edg|Firefox|FxiOS/.test(navigator.userAgent);
+
 const allIcons = { Bold, Italic, Strikethrough, Underline, Code, Link, List, ListOrdered,
     ListChecks, Quote, Minus, Table, FileCode, ChevronDown, Type, MoreHorizontal, Pencil, BookOpen, Link2, Link2Off, Printer, Image: ImageIcon, Upload, Sun, Moon };
 
@@ -89,9 +95,9 @@ function renderReadMode() {
         <button class="toolbar-btn theme-toggle-btn" id="emb-theme-toggle" data-tooltip="${t("toolbar.theme") || "Toggle theme"}">
             <i data-lucide="${isDark ? "sun" : "moon"}"></i>
         </button>
-        <button class="toolbar-btn print-btn" id="emb-print-btn" data-tooltip="${t("toolbar.print") || "Print"}">
+        ${_isMacWebKit ? "" : `<button class="toolbar-btn print-btn" id="emb-print-btn" data-tooltip="${t("toolbar.print") || "Print"}">
             <i data-lucide="printer"></i>
-        </button>
+        </button>`}
         <button class="toolbar-btn cursor-sync-btn${cursorSyncEnabled ? " active" : ""}" id="emb-cursor-sync" data-tooltip="${t("toolbar.cursor_sync") || "Cursor sync"}" aria-pressed="${cursorSyncEnabled}">
             <i data-lucide="link-2" class="sync-on-icon"${cursorSyncEnabled ? "" : ' style="display:none"'}></i>
             <i data-lucide="link-2-off" class="sync-off-icon"${cursorSyncEnabled ? ' style="display:none"' : ""}></i>
@@ -206,9 +212,9 @@ function renderEditMode(level) {
         <button class="toolbar-btn theme-toggle-btn" id="emb-theme-toggle" data-tooltip="${t("toolbar.theme") || "Toggle theme"}">
             <i data-lucide="${isDark ? "sun" : "moon"}"></i>
         </button>
-        <button class="toolbar-btn print-btn" id="emb-print-btn" data-tooltip="${t("toolbar.print") || "Print"}">
+        ${_isMacWebKit ? "" : `<button class="toolbar-btn print-btn" id="emb-print-btn" data-tooltip="${t("toolbar.print") || "Print"}">
             <i data-lucide="printer"></i>
-        </button>
+        </button>`}
         <button class="toolbar-btn cursor-sync-btn${cursorSyncEnabled ? " active" : ""}" id="emb-cursor-sync" data-tooltip="${t("toolbar.cursor_sync") || "Cursor sync"}" aria-pressed="${cursorSyncEnabled}">
             <i data-lucide="link-2" class="sync-on-icon"${cursorSyncEnabled ? "" : ' style="display:none"'}></i>
             <i data-lucide="link-2-off" class="sync-off-icon"${cursorSyncEnabled ? ' style="display:none"' : ""}></i>
diff --git a/src/extensionsIntegrated/Phoenix-live-preview/MarkdownSync.js b/src/extensionsIntegrated/Phoenix-live-preview/MarkdownSync.js
index 78f90080b..e3fd3f808 100644
--- a/src/extensionsIntegrated/Phoenix-live-preview/MarkdownSync.js
+++ b/src/extensionsIntegrated/Phoenix-live-preview/MarkdownSync.js
@@ -55,7 +55,7 @@ define(function (require, exports, module) {
     let _cursorUndoStack = [];
     let _cursorRedoStack = [];
 
-    const DEBOUNCE_TO_IFRAME_MS = 150;
+    const DEBOUNCE_TO_IFRAME_MS = 50;
     const SCROLL_SYNC_DEBOUNCE_MS = 16;
     const SELECTION_SYNC_DEBOUNCE_MS = 200;
 
@@ -131,6 +131,14 @@ define(function (require, exports, module) {
                 break;
             case "mdviewrCursorSyncToggle":
                 _cursorSyncEnabled = !!data.enabled;
+                // Clear CM line highlight when cursor sync is disabled
+                if (!_cursorSyncEnabled) {
+                    const cm = _getCM();
+                    if (cm && _highlightLineHandle) {
+                        cm.removeLineClass(_highlightLineHandle, "background", "cm-cursor-sync-highlight");
+                        _highlightLineHandle = null;
+                    }
+                }
                 break;
             case "mdviewrThemeToggle":
                 sendThemeOverride(data.theme);
diff --git a/src/view/PanelView.js b/src/view/PanelView.js
index aeedd540e..f862e1a57 100644
--- a/src/view/PanelView.js
+++ b/src/view/PanelView.js
@@ -842,9 +842,10 @@ define(function (require, exports, module) {
             _toggleMaximize();
         });
 
-        // Double-click on tab bar toggles maximize (exclude action buttons and add button)
+        // Double-click on empty tab bar area toggles maximize.
+        // Exclude tabs themselves, action buttons, and the add button.
         _$tabBar.on("dblclick", function (e) {
-            if ($(e.target).closest(".bottom-panel-tab-close-btn, .bottom-panel-hide-btn, .bottom-panel-maximize-btn, .bottom-panel-add-btn").length) {
+            if ($(e.target).closest(".bottom-panel-tab, .bottom-panel-tab-close-btn, .bottom-panel-hide-btn, .bottom-panel-maximize-btn, .bottom-panel-add-btn").length) {
                 return;
             }
             _toggleMaximize();