When you Press ALT+TAB while in full screen mode, if you are in a multiplayer setting, whether on a friends world or server, it kicks you out the game and sends you back to the main menu.
MCPE-223414
Kicks you out of multiplayer games when ALT+TAB'ing in full screen
Resolved
Duplicate
0
ThatBozo
(Unassigned)
Unconfirmed
Windows
Windows 10
1.21.92 Hotfix
Retrieved
This issue is being tracked at MCPE-109879.