I recommend that you always leave "Connect Island Rooms" turned on.    The program will automatically put in a room divider wall when your plan has an unconnected room. The program does this because having unconnected island rooms can cause a multitude of problems with room definitions which can affect things like living area calculations, floors and ceilings, room moldings, and lots more.    Unless you really know what you are doing, you should not turn them off.  Even if yo