Help logging in on primary monitor on Gnome

Hello. I am having issues with the login screen defaulting to my laptops built in screen instead of the monitor I have set as my primary display in gnome. I got this working at one point with some help when someone helped me copy the monitor.xml file in a particular way.. maybe to the GDM user if i'm starting to understand?

Anyway.. I accidentally broke this attempting to set a background image on login (which I'd like to do, but at this point can live without) and would really appreciate help getting my login back onto the correct screen. Thank you for your help!

Edit: While this is open i might as well ask/add: is the GDM settings flatpak not a good way to change these settings on bazzite? Am I doing something wrong with it?
Solution
Solved by running:

machinectl shell gdm@ /usr/bin/env gsettings set org.gnome.mutter experimental-features "$(gsettings get org.gnome.mutter experimental-features)"

I do not understand how this works/what this does and would appreciate any explantion of why it fixed my issue (found command here): https://github.com/gdm-settings/gdm-settings/issues/283
GitHub
What happened? tested with a single 4K160 display connected. VRR enabled (the defect case): enable VRR in Gnome Settings "Apply current display settings" in gdm settings -> successful ...
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