not so sure it tell you anything about how it is set?
usually it is on LEGACY,
( would take a while to find where/how that is to find,
just for info in KMS mode you loose all your display resolution settings
( and are not even able to set them again! )
and might not see full window in HDMI
the KMS mode i only use if there is a Processing example ( some P3D)
what just not run in LEGACY mode
and again, i just say i did not test VNC in that mode… thats it.
? is it like a school class setup where you want check in from one computer
onto many RPI? ( use fix IP-setup ??)