Gothic

I'm using Home Designer Architectural 2017 with latest update.  The window was placed from the library,  i.e.,  Architectural/windows/round.  If you can instruct me how to do this using arch settings I would appreciate it.  Thanks much.....

I want to place a round window onto a wall and increase the size.  As I expand the dimensions the round window eventually becomes a square window.  Is the any way I can make this window larger and still maintain the correct shape of the window ?  The same also happens for oval windows.

I have 2 adjoining rooms with different ceiling heights.  If I try to place a crown molding in the taller of the 2 rooms, it disappears along the wall that connects with the shorter room.  It will appear if I bring the crown molding down to the height of the shorter room, but I want the top of the molding at the height of the taller room.   Does anyone know what I need to do to get a continuous molding at the proper room height ?