Turn off typewriter mode in fullscreen


I would like to disable the typewrite mode in fullscreen. I have de-selected this option in tools-options-editor, but I don’t know how to turn the function off in fullscreen. I have tried cntrl-win-t, which I think is the shortcut. I did find a post on the web from someone who claimed to have found a way, but he never revealed his solution. Any help appreciated.