Move walls in map editor

The LIDAR detection thinks part of my hallway is part of the bedroom. If I try to merge the hallway portion to the actual hallway, it says the split is too small. Is there a way to move the virtual wall it thinks separates rooms? Once it maps a room, is there a way to manually set the room separators?

Can you merge the hallway, hallway portion and the nearby room together first, then separate them into 2 afterward?

I think that’s what I did in a similar situation when I was experimenting with my map when it gave me a similar error.