Or a right angle to the bottom side.
What shape are you trying to get?
The only thing I can't get it to do is a right angle at the side/top with a sloping sill.
There is a freeform window in the old Object Depository that was made for version 8 - will work with 11.
http://archicad-talk.graphisoft.com/object_depository.php
Look in the Windows & Doors section.
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11