Turn xfce off

[Frank]

OK. I downloaded and installed xfce, exited the kde session and issued 
startxfce4 and quite enjoyed what I saw.

However, when I left that session and loged in again to kde, I got xfce 
sitting on top of it.

I don't mind really, but find it is sometimes in the way while I try to 
get things done and while I'm still RTFM for xfce, I would like to 
reboot my system and see only kde there for now.

I didn't config anything so ask what it is I need to 'undo' for now. [ 
NO! I do not want to uninstall xfce.]

-- 
Regards

Frank

Big or small, a challenge requires the same commitment to resolve.
Registered Linux User # 324213