Multiple displays are always a shit show. Once a year I try out a current distro, and within a week I'm back on Windows. This time was Bazzite, and the exact same problems as always, both Plasma and Gnome, just last week. After all this time windows still don't remember their size and position, and right click context menus randomly break and show up on the opposite monitor. Go and look up the bugs, and I can see they've been a problem for like 5-15 years.
If you give up on Linux for the time being, I HIGHLY recommend looking up Windows Xlite. It is a highly modified Windows 10 or 11 iso. They even have the option to install without Windows Defender, its such a breath of fresh air, almost feels like being back on XP or 7.