When you try to execute the command /gamemode in the editor mode, it says that this command isn't supported but it's possible to change the gamemode in the menu. See here: https://1drv.ms/v/s!Asr1UnK1Sz_LgQRMZrYTuN8dw7iz?e=U2erjl
MCPE-168088
Gamemode can be changed in the menu in editor mode
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