Double Login Screen

Please check if this tutorial helps:

It is strange indeed that the issue is occurring only now, of course.
In my opinion it could be an issue due to the recent long-awaited sddm update to release 0.20.
Anyway, just give it a try if you want.
I’ve seen also this similar old (again, strange) sddm issue:

but it’s unsolved…
Actually, a comment from an Arch user links (as solution) to this Arch Wiki article/chapter:
https://wiki.archlinux.org/title/SDDM#Overlapping_greeters_on_multiscreen_setup

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