Hmm yeah those are the moments I thought of too. And in those you don't really get much of a glimpse of the room. It's been since I saw the one where Stephanie moves in with Michelle (Divorce Court?) but if we did see DJ's room the part where Stephanie was pretty bare (and understandably so). In Fuller House for some reason I'm thinking there was still the second bed there (because she would have used Jesse's I assume when she lived in there). It has to be something you're trying to look out for I guess though.
I believe we do see the room with just DJ's bed in both Divorce court, and Fuller House.
In Divorce Court, DJ roller blades around the empty part of the room. Then one of the guys (either Jesse or Danny, can't remember) comes in and asks about Stephanie, DJ responds with "Stephanie who?"
In Fuller House, there a scene where Stephanie comes back into DJ's room, complains that it's lonely sleeping in
Uncle Jesse's room, and that she misses DJ. Then DJ gets Stephanie to leave by saying that sleeping in seperate rooms will bring them closer together.
Stephanie also moves back into her old room in The Seven Month Itch Part 2, but I don't think we see DJ's room during the time when Stephanie moves out.