After a longer break, I started LibreOffice again today (KDE Plasma) and the small welcome window, which usually appears in the middle of the screen when LO is started, was at the top left of the screen. Even after several restarts nothing has changed.
Wayland?
nope, X11
I have since found out myself what the problem is: It’s a bug that occurs as soon as you create a window rule in Plasma. I had only one active (Firefox window), but after deleting it Libreoffice started normally again.
I’m glad you fixed it. My guess was Wayland because the protocol doesn’t allow Windows to set their own position on the screen.
Well, that’s KDE, always a surprise … 
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