Change Guest Resolution Windows (Virtualbox)

First close virtualbox windows

then run this command in your terminal

$ VBoxManage setextradata global GUI/MaxGuestResolution any
$ VBoxManage setextradata "Win 10" "CustomVideoMode1" "1366x786x32"

source: https://superuser.com/questions/443445/how-can-i-get-virtualbox-to-run-at-1366×768

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