To swap tiles click on one tile (will become highlighted), then on another one. Blank fields are selectable too.
To rotate tile click on one tile (will become highlighted), then on the same tile. It makes sense for 'piksele-1' and 'maziaje-1' tiles only.
Red lines are indicating borders of a bathroom area. Main area is a bathroom connected with a part of a halway. Small area is a floor part under a shower.