Placing Doors or Windows

Note: If you hover the cursor in a place where several Walls intersect, click Tab to toggle among them until the one you want is highlighted.
The Anchor Point determines whether you will place the Window or Door by its centerpoint or either side.
5.
Next, you will choose the opening direction: toward the inside or outside of the wall, either on the right or the left: each possibility is shown by an arrow on screen.
The sun icon represents the reveal side that you chose with the first click. You can still change the reveal side now: press Tab to toggle the two reveal sides for this opening.
The Flip button (in the Info Box or Door/Window Settings) switches the opening direction of a selected door/window from one side to the other, while keeping the frame in place.