I don't know what the German version would be for the name, but maybe this screenshot helps. If you set "right-win" I think that'd mean the Apple key on the right, so you could make that be AltGr.
I don't know what the German version would be for the name, but maybe this screenshot helps. If you set "right-win" I think that'd mean the Apple key on the right, so you could make that be AltGr.