As soon as the game is in fullscreen mode, alt-tabbing out of it will deconnect you from the server you're connected to. It is a known bug that I have found multiple complaints about, but it is not fixable unless you decide to desactivate fullscreen, which is not the goal.
Please fix, this is the only game that does that and it is infuriating to deal with.
Thank you.
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We're tracking this issue in MCPE-109879, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MCPE-109879. This issue should be tagged to the MCPE-109879 report and be closed as a duplicate.