In ABD CE the curtain wall tool is still lacking basic functionality to that of its competitors (R) and is lacking is so many areas ie
You cannot change the location of the glazing within the frame ie make it flush, which 99% of all building are now.
You cannot change a panel(s) from glazing to solid
You cannot change a panel size without changing the entire curtain wall.
You cannot simply add mullions
You cannot spilt a panel into 2 or more
and so on...
There is no sketch mode.