Since the system settings for windows decoration crashes every time I open it (I know it's a bug that's supposedly fixed) I can not change my windows decorations and maybe fix the crashing by cleaning up theses config files....

So please, does anyone know how to change the windows decorations back to "Breeze" or "Oxygen"?

Thx for your help and efforts,
piedro

Can you try looking in ~/.config/kdeglobals?

more like "~/.config/kwinrc", section "[org.kde.kdecoration2]", key "library=org.kde.breeze"

This edit fixed it for the time being (as discussed before in the corresponding bug report.... which I won't link here because it's probably the wrong topic...)
Seems like there's something wrong with the oxygen decoration.

Thx again.
p.

This supposedly fixed bug is annoying.