So, I recommend that once you're in full screen mode, experiment a little bit with your monitor settings, there usually is something that makes the entire display slide left-right and up-down. and as you're discovering if the display doesn't display those edge pixels, your mouse won't activate things like that dropdown tab. IIRC I discovered then that when I went to full screen with a Guest for whatever reason my physical monitor shifted the display slightly and some edges or sometimes the overall geometry of the display was off a few pixels. WilIt's been a very, very long time since I personally experienced what you described. My best solution thus far has been to move the pointer into the upper left corner to display the open apps and just X out of the console, and reopen if needed which make it a window again. Problem: I enabled Full Screen Mode in the guest system, and now I can't get out of it I tried F11 and Ctrl+Alt+Esc, but neither of those work. If you want this display to fill up the entire screen, you need to execute. The Window goes to full-screen mode but the display remains the same and occupies the central position. While the above option is called Full Screen Mode, it doesn’t actually change the size of the Virtual Machine display.

I ran my mouse all across the top of the screen and it will not make the menu reappear. How to Make VirtualBox Actually Full Screen.

However with a little testing I find when it I first the console into full screen that drop down pops up briefly, then disappears.

Exit full screen virtualbox windows