Index: gui/ksysguard.h
===================================================================
--- gui/ksysguard.h
+++ gui/ksysguard.h
@@ -76,6 +76,7 @@
     void currentTabChanged(int index);
     void updateProcessCount();
     void configureCurrentSheet();
+    void toggleShowMenuBar(bool showMessage = true);
 
   private:
     void setSwapInfo( qlonglong, qlonglong, const QString& );
@@ -101,6 +102,7 @@
     QAction *mConfigureSheetAction;
     QAction *mHotNewWorksheetUploadAction;
     QAction *mRefreshTabAction;
+    QAction *mShowMenuBarAction;
     QLabel *sbProcessCount;
     QLabel *sbCpuStat;
     QLabel *sbMemTotal;
Index: gui/ksysguard.cpp
===================================================================
--- gui/ksysguard.cpp
+++ gui/ksysguard.cpp
@@ -51,6 +51,7 @@
 #include <QLabel>
 #include <QSplitter>
 #include <QStatusBar>
+#include <QMenuBar>
 
 #include <KAboutData>
 #include <KActionCollection>
@@ -143,10 +144,27 @@
   mConfigureSheetAction = actionCollection()->addAction( QStringLiteral("configure_sheet") );
   mConfigureSheetAction->setIcon( QIcon::fromTheme(QStringLiteral("configure")) );
   connect(mConfigureSheetAction, &QAction::triggered, this, &TopLevel::configureCurrentSheet);
+  // set up 'Settings' menu
+  mShowMenuBarAction = KStandardAction::showMenubar(this, SLOT(toggleShowMenuBar()), actionCollection());
 
   retranslateUi();
 }
 
+void TopLevel::toggleShowMenuBar(bool showMessage)
+{
+    if (mShowMenuBarAction->isChecked()) {
+        menuBar()->show();
+    } else {
+        if (showMessage) {
+            const QString accel = mShowMenuBarAction->shortcut().toString();
+            KMessageBox::information(this, i18n("This will hide the menu bar completely."
+                                                " You can show it again by typing %1.", accel),
+                                     i18n("Hide menu bar"), QLatin1String("HideMenuBarWarning"));
+        }
+        menuBar()->hide();
+    }
+}
+
 void TopLevel::setLocalProcessController(ProcessController * localProcessController)
 {
   Q_ASSERT(!mLocalProcessController);