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I'm having trouble maximising the window to full screen, therefore eliminating the top menu bar from view,

I don't want this bar to be invisible to viewers when projecting live.

I get this message when going > windows > max window (command M)

jit.qt.grab: a grabber component is already open.

 I get this message when going > windows > max window (command M)

Help maximising window to hide Max menu options on top of screen