I went to System Settings > Themes > Login Screen (SDDM) in KDE settings and changed from the default Breeze to Maldives, and that broke SDDM login screen to bl

I went to System Settings > Themes > Login Screen (SDDM) in KDE settings and changed from the default Breeze to Maldives, and that broke SDDM login screen to black text mode with a cursor. Later searching for fixes I found that only Breeze was compatible with Qt 6.x, and any other choices there would break SDDM the same way (I did not try it though). First, I had to figure out how to manually mount LUKS-encrypted laptop drive while booting from a USB stick, that took a while. Trying to recover, I re-installed kde, sddm and sdd-kcm and qt5-declarative packages. Still broken. I made sure /etc/sddm.conf was the default configuration, still broken. Then finally I stumbled upon /etc/sddm.conf.d/kde_settings.conf, which was still overriding defaults to Maldives. Deleting it finally fixed the SDDM login. My wife was thoroughly not impressed with Linux out-of-box experience! No Nvidia graphics, this was a Lenovo Yoga laptop with AMD graphics.