When an external monitor is connected, the Zorin OS login screen (GDM) still appears on the laptop’s built‑in display. The user session correctly uses the external monitor as primary, but GDM does not follow this layout unless manually configured. This creates a confusing UX, especially for users who always work with an external display....
Current Workaround:
sudo mkdir -p /var/lib/gdm3/.config
sudo cp ~/.config/monitors.xml /var/lib/gdm3/.config/
sudo chown gdm:gdm /var/lib/gdm3/.config/monitors.xml
After restarting GDM, the login screen correctly appears on the external monitor.