To add to this, I seem to be having problems with manjaro-kde-settings that I posted about in another thread:
When updating manjaro-kde-settings my multi-monitor setup goes crazy and is unusable. I tried re-applying themes, etc. and the problem remains. The only fix I’ve had is reverting back to a previous version of manjaro-kde-settings.
(Posting here because that other thread doesn’t seem to be noticed and was tagged as a different issue)