The following…
…doesn’t look like a xrandr command. Or does this get translated into an xrandr command by virt-manager GUI? If yes, how does such a command get sent to the VM?
KVM “guestcontrol” does not seem easy as per post CS Student Capstone (Bachelor's Senior project) for Whonix - #12 by HulaHoop
(“guestcontrol” is a VirtualBox feature. I haven’t seen something similar for KVM yet. I.e. a way for the host to send commands to a KVM VM.)
Or is that some other virt-manager / KVM feature? If so, I guess “Check: Always” would be a setting that gets stored somewhere - hence could be pre-configured somehow.
Does XFCE Start Menu → Settings → Display → Resolution: → Choose a higher resolution resolution → Apply work?
xrandr did have no effect at all or non-ideal screen resolution?
If so, I can probably translate that into an xrandr command. xrandr use on command line isn’t the most simple thing…
But above would be preferred.