CentOS - Jul 2020 - Windows guest 4K virt-manager

I am running CentOS 7 and windows 10 guest.
Trying to get 4K on Windows resolution.

I did the "virsh edit Win10" and found the video setting an changed it
to
64M.
After shutting down and booting back up (all of virt-manager) my resolution
is still not
higher the 2560x

Anyone gotten 4K on windows guest ?
Whats the trick.

I am using QXL.
Thanks,

jerry