Garage Floor to Stem Wall set in Defaults but not showing in Actual Room Spec - Structure

[MountainMan]

Good Day. I've set the Stem Wall to Floor height as 3" in my Garage Foundation defaults. When I draw the garage in my plan, the SWT to Ceilng value is greyed out and the SWT to Ceiling value is the same as the Rough Ceiling height - ie no stem wall above floor. What am I missing?

X15

[TeaTime]

Maybe a silly question, but was the room set as a Garage room type before the foundation was built?

There are other settings that should be set on that type of room - in short: that doesn't look like a Garage room at all.