Index: /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpBrowserWidget.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpBrowserWidget.cpp	(revision 86874)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpBrowserWidget.cpp	(revision 86875)
@@ -371,4 +371,5 @@
     void setFontPointSize(int iPointSize);
     int fontPointSize() const;
+    void setFontScaleWidgetVisible(bool fToggled);
 
 protected:
@@ -1369,4 +1370,10 @@
         return 0;
     return pTab->fontPointSize();
+}
+
+void UIHelpBrowserTabManager::setFontScaleWidgetVisible(bool fToggled)
+{
+    if (m_pFontScaleWidget)
+        m_pFontScaleWidget->setVisible(fToggled);
 }
 
@@ -1465,4 +1472,5 @@
     , m_pShowHideSideBarAction(0)
     , m_pShowHideToolBarAction(0)
+    , m_pShowHideFontScaleWidget(0)
     , m_pFontSizeLargerAction(0)
     , m_pFontSizeSmallerAction(0)
@@ -1512,5 +1520,5 @@
     m_pShowHideSideBarAction->setChecked(true);
     connect(m_pShowHideSideBarAction, &QAction::toggled,
-            this, &UIHelpBrowserWidget::sltHandleSideBarVisibility);
+            this, &UIHelpBrowserWidget::sltHandleWidgetVisibilityToggle);
 
     m_pShowHideToolBarAction = new QAction(this);
@@ -1518,5 +1526,11 @@
     m_pShowHideToolBarAction->setChecked(true);
     connect(m_pShowHideToolBarAction, &QAction::toggled,
-            this, &UIHelpBrowserWidget::sltHandleToolBarVisibility);
+            this, &UIHelpBrowserWidget::sltHandleWidgetVisibilityToggle);
+
+    m_pShowHideFontScaleWidget = new QAction(this);
+    m_pShowHideFontScaleWidget->setCheckable(true);
+    m_pShowHideFontScaleWidget->setChecked(true);
+    connect(m_pShowHideFontScaleWidget, &QAction::toggled,
+            this, &UIHelpBrowserWidget::sltHandleWidgetVisibilityToggle);
 
     m_pPrintDialogAction = new QAction(this);
@@ -1679,4 +1693,6 @@
     if (m_pShowHideToolBarAction)
         m_pViewMenu->addAction(m_pShowHideToolBarAction);
+    if (m_pShowHideFontScaleWidget)
+        m_pViewMenu->addAction(m_pShowHideFontScaleWidget);
 }
 
@@ -1769,4 +1785,6 @@
     if (m_pShowHideToolBarAction)
         m_pShowHideToolBarAction->setText(tr("Show Tool Bar"));
+    if (m_pShowHideFontScaleWidget)
+        m_pShowHideFontScaleWidget->setText(tr("Show Font Scale Widget"));
     if (m_pPrintDialogAction)
         m_pPrintDialogAction->setText(tr("Print..."));
@@ -1794,14 +1812,21 @@
 }
 
-void UIHelpBrowserWidget::sltHandleSideBarVisibility(bool fToggled)
-{
-    if (m_pTabWidget)
-        m_pTabWidget->setVisible(fToggled);
-}
-
-void UIHelpBrowserWidget::sltHandleToolBarVisibility(bool fToggled)
-{
-    if (m_pTabManager)
-        m_pTabManager->setToolBarVisible(fToggled);
+void UIHelpBrowserWidget::sltHandleWidgetVisibilityToggle(bool fToggled)
+{
+    if (sender() == m_pShowHideSideBarAction)
+    {
+        if (m_pTabWidget)
+            m_pTabWidget->setVisible(fToggled);
+    }
+    else if (sender() == m_pShowHideToolBarAction)
+    {
+        if (m_pTabManager)
+            m_pTabManager->setToolBarVisible(fToggled);
+    }
+    else if (sender() == m_pShowHideFontScaleWidget)
+    {
+        if (m_pTabManager)
+            m_pTabManager->setFontScaleWidgetVisible(fToggled);
+    }
 }
 
Index: /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpBrowserWidget.h
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpBrowserWidget.h	(revision 86874)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/helpbrowser/UIHelpBrowserWidget.h	(revision 86875)
@@ -87,6 +87,5 @@
     void sltHandleHelpEngineSetupFinished();
     void sltHandleContentWidgetItemClicked(const QModelIndex &index);
-    void sltHandleSideBarVisibility(bool togggled);
-    void sltHandleToolBarVisibility(bool togggled);
+    void sltHandleWidgetVisibilityToggle(bool togggled);
     void sltShowPrintDialog();
     void sltHandleContentsCreated();
@@ -168,4 +167,5 @@
     QAction             *m_pShowHideSideBarAction;
     QAction             *m_pShowHideToolBarAction;
+    QAction             *m_pShowHideFontScaleWidget;
     QAction             *m_pFontSizeLargerAction;
     QAction             *m_pFontSizeSmallerAction;