Run a garuda-update again and reboot and see if the issue persists.
Might be related to this thread that we are still working on a solution for Can't change the resolution, the monitor is unknown - #32 by omar1218
Searching more on the issue today, I came across this "Unknown" primary display (Gnome + Nvidia + Dual monitor) / Newbie Corner / Arch Linux Forums suggesting to enable DRM (Direct Rendering Manager) for Nvidia NVIDIA - ArchWiki