The reason you can’t change the Windows 11 resolution in VirtualBox is that the virtual machine lacks the proper graphics drivers to communicate effectively with the host system. By default, ...
If the “Auto-resize Guest Display” is greyed out for you, go ahead and reboot your virtual machine and check if the issue is resolved. In case that doesn’t work, go ahead and restart your VirtualBox.
I am using Ubuntu 10.04 amd64 host and Ubuntu 10.10 amd64 guest. The guest additions corrupted the video of the guest after install, so you might want a separate ssh session on your guest to restart X ...
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