So I’ve installed the plasma login manager and I have to say it’s lovely. It removed a long standing issue I disliked about sddm, that being prompted with a log in dialog on both monitors at once. Not what I was looking for.
The issue I was having though is that the left/right order in which I have my monitors was reversed. That’s easy to deal with as a user, just go to the display conf screen and move them around but I could not find anything that would allow this on a global level. So I took a look at the .config directory for plasmalogin and noticed that it has its own independent kwinoutputconfig.json file. So as an experment as root I renamed the kwinoutputconfig.json file as a backup and copied the kwinoutputconfig.json file from my user ID to the /var/lib/plasmalogin/.config folder and now when I go to log in it has my monitors property ordred.
Wanted to post this in case someone is looking for a solution. Not sure if this is the right one but it worked for me.
Using KDE Neon currenty.