Continuing the discussion from Wayland monitors.xml interaction with xorg monitors.xml:
I tried to follow https://unix.stackexchange.com/questions/78044/how-to-let-gdm-shares-monitor-configure-with-gnome/352404#352404 to configure which monitor is primary, etc. But that did not help.
This was their suggestion: cp ~/.config/monitors.xml /var/lib/gdm/.config/monitors.xml
What is the current state of configuring the use of monitors by GDM?