A layout is one whole plan — its own set of rooms, items and doorways, saved independently of every other layout. Open one to edit its rooms.
Grab a wall and drag it to reshape the room from that side. Click a piece to move it, or drag its handles to resize; use the palette to add custom items, pendant lights and doorways.
Drag any wall to move it. Click the + tab on a wall to add a right-angle notch there; click the × on a notch to remove it.
Nothing selected — click an item on the plan, or add one from the palette.