See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=508634 Description : Once the fullscreen mode is turned on in Okular it refuses to go back and hides even the menubar. Even pressing ctrl+shift+f does not help. Closing Okular and opening another file does not help. It stays in that fullscreen mode. Workaround : I am posting the workaround here. Unfortunately you have to manually edit the okularrc file each time you go fullscreen. Goto the folder $HOME/.kde/share/config (or a similar folder for kde4- .kde4/share/config/). Open okularrc in gedit. It would show something like - [Desktop Entry] FullScreen=true [MainWindow] Height 900=901 MenuBar=Disabled State=AAAA/wAAAAD9AAAAAAAABaAAAAOEAAAABAAAAAQAAAAIAAAACPwAAAABAAAAAgAAAAEAAAAWAG0AYQBpAG4AVABvAG8AbABCAGEAcgAAAAAAAAAFoAAAAAAAAAAA Width 1440=1441 [MainWindow][Toolbar mainToolBar] Hidden=true [Notification Messages] presentationInfo=false Enable the menubar : MenuBar=Enabled. Disable fullscreen : FullScreen=false Fire up Okular agai...