Guys, you just accidentally have hit F11, the key for "fullscreen" mode!
QuoteJohn AtkinsonExperimented by trying F2,GUI Appearance,Full Screen. Found the 3 Hide boxes checked. Unchecked them - problem solved.
Congrats, but despite now seeing more toolbars, you're still in fullscreen mode
By default this has no toolbars, though they can be switched on one by one if desired.
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