A debug tool to edit the bounds of a room, much like the creative mode tool announced 6 years or so back, but just for editing/adding/removing room bounds.
At the moment there is no way to fix issues arising from demolishing walls between rooms, for instance, the claustrophobic trait still treats the demolished area as its own room, causing panic when the player is standing in a large room.
See the vid below for clarification on problem and the gif below for where I took inspiration (https://www.youtube.com/watch?v=-EhAwjexVXQ):