Normally in games, you can open the Windows 10 Game Bar by pressing Windows+G.
The Game Bar can be used to monitor your System Performance, and also to take screenshots and record video clips of your game.
However, when Minecraft is in Fullscreen mode, the Game Bar fails to launch and shows an error message.
[media]This is definitely not a problem with the Game Bar, since it works well in many other Fullscreen programs and games.
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Most applications can't show when a game is fullscreen.
some of them has the option to force itself (like discord).
so, as matheesha said, you will have to use a software to do it.
or else play bordered non-fullscreen.
Might be related to MC-121367
you have to use a software to force change it to a borderless window