Dr. Nikolaus Klepp composed on 2023-04-16 19:16 (UTC+0200):
These come from xdg-somthing-settings. You can use tde control center -> system settings -> paths to change them. Set the folders you don't like to your home directory, log out and in again, then "rmdir ~/*" to get rid of all those empty folders.
alternative: edit .config/user-dirs.dirs by hand, works just the same :)
Now that you have written this alternative I remember it's what I did many many moons ago. I made one for my LAN server and copy it to ~/.config/ before logging into any X session the first time, but it's been a while since I've created any new users. ;)