How to get rid of this...

I checked my settings and I see that this TAB for on/off works in my VR mode as default, but not on 2D screen.
This is this option I suppose:



You can bind here TAB also or the button to check it.
 
I think you can also set your mouse pointer to the border of the screen (up, or sides), then the bar will behave as before.
This is in windowed (maximized) mode though, not fullscreen.
 
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