Mint stopped supporting KDE a couple of years ago :(
I had to switch to Kubuntu (after trying several others out.... I finally settled with Kubuntu).
Cinnamon/Mate just don’t cut it for me :P
i do like cinnamon, but I’ll check out kubuntu from a disk, see how it looks and feels- i don’t really care for straight ubuntu- mybe the kubuntu will feel different-
I use Mate w/Compiz on Fedora(now v.34) and RaspiOS. It works for me.
Set Compiz to switch desktops by moving mouse to edge of screen and clicking. Or grab the top of the screen and twirl the desktops. Simply grab a window and drag it to a different desktop. Years ago started using such configs and it is hard to live without them (for me, anyway).
Cheers!