Cool so I'm not crazy
It's the first time I've really tried to use the Curtain Walling tool it has taken a bit of head scratching plus watching tuts on Youtube, plus reading the manual to suss most of it out.
Things I like are...
In the Design Menu you can redefine a CW by extracting a fill of it and then editing the fill shape to the one you want and then apply that shape to the CW
Things I don't like....
If you do what I said above and your CW wraps around four sides of the building then even although I only wanted to apply a sloping ground plane to one elevation AC did it to the opposite one as well! I then had to redraw the curtain walling as two separate segments but then that messes up the junction between the two for which as yet I haven't found a solution.
I wish you could edit the mullion positions in the Plan, Section or Elevation windows but I guess other folks have come up with that one already cos its bleedin obvious in't?
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics