For the creation of a house’s floor plans you need to join the already measured rooms to each other from the individually drawn and measured room polygons. You can join two rooms through their doors or windows. Matching is done through identifying both sides of a wall opening in both rooms containing it.
To match two sides of an opening, find both sides of the door in both two rooms, and select them. Tap one side of the door in one of the rooms and hold your finger on the screen and move it to the other side of the door in the other room and release the screen. A window appears where only the wall thickness is to be measured. Here you have the option to pair only the door sides in case the two rooms were already connected through another wall opening. In this case you don’t need to set anything.