I'm trying to understand why some windows in v10 have the option of adding masonry arches above the windows while some don't.
All my attempts are with windows installed in walls with brick or rock veneers, and some arched or eyebrow windows don't offer the arch option while some rectangle windows do.
MacBook Pro, Leopard 10.5.6, 2.5GHz, Intel Core 2 Duo, 4GB, ArchiCAD v10