This week in KDE: changing the wallpaper from within System Settings

In my experience too KDE Neon unstable is a total mess.

Maybe try the new Fedora Rawhide with KDE? There even is an immutable image now. I will try that on Baremetal in a few minutes, as in the VM scaling and all was a mess, but VMs also just dont cover regular use scenarios (dual monitors, energy saving, fingerprint sensor (I want to keep mine for the host lol), memory, actually working GPU (thanks AMD mobile bullshit CPUs)