Make sure the "Floor Plan Display" for your wall is set to "Projected With Overhead".
Then you can adjust the "Floor plan cutting plane" to the desired height to get the cut fill you desire if the wall profile changes at various heights.
The other thing to watch out for is Model View Option settings - but these will affect your regular walls also so that probably isn't your problem.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11