When on fullscreen I am unable to open another thing using Alt+Tab (the screen goes black on every other app, even in the desktop). I have to press F11, and then I have to open other stuff and then I have to press again F11 to go back to the fullscreen gameplay.
P.S. When trying the Alt+Tab/Win+Tab method, there only thing that displays is literally just the game.
Please force a crash by pressing
F3 + Cfor 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.