I don't know if it works on all apps., but on some ' esc ' will bring you back to normal view. That's assuming, of course, that you still have any control of the app. Maybe it's because i'm running Gnome in the background of XFCE - for dependencies - but ctrl-alt-backspace works to bail out to the loging screen
To get the right answer, one must first ask the right question!
Desktop F20 ( 64 bit )
Laptop F20 ( 32 bit )