So I built the medium shuttle and started fueling it. I added a Large Storage. I tried the open seat and didn't get a launch menu. So time to research the closed/shuttle seat - in the Small-printer section. However, the small printer doesn't see it. I tried the Vehicle-bay and it could print either type of seat onto the shuttle.
I printer an closed/shuttle seat. But no menu. I found I could remove the seat! So I tried all four positions - no menu.