Curtain walls are "real systems" and parts cant be rotated, unless you create really new parts (in reality)
But there is the possibility in Archicad to apply your own polygons for the framing. You design the frames by yourself and apply it to the Curtain wall
AC5.5-AC27EduAut, PC-Win10, MacbookAirM1, MacbookM1Max, Win-I7+Nvidia