Rotating any item freely in 3D is a long-standing wish. For now, it will only work in Archicad out-of-the-box with GDL objects programmed to allow it, or if you tweak the script of such an object.
I have to remind myself often that the constraints in Archicad as-is is what makes the program fast. I used Triforma. I know. But it would be nice to have it anyway, as an option - you should be able to optionally un-lock the constraints for chosen items, I think. Objective is a way around this limitation..
AC4.1-AC26SWE; MacOS13.5.1; MP5,1+MBP16,1