Tried all meta-key + escape combos, nothing works. If escape keys differ in OSX & Windows, please list both.thanks.
Didn't know placing cursor on top of screen brings back menu bar..
You can press the same key combination you used to enter distraction free mode. You can also press the key binding for regular full screen mode, which will also exit from distraction free mode.
On Mac OSX, it's Ctrl-Shift-Command-F to enter and leave Distraction-free mode.