How to Invisible the wall when you look through outside of the room

When you create a room with the walls, it's an inconvenience to work when you view outside of the room. The walls will block your view to see inside. It's a way you don't have to hide the wall physically but still could see through the wall from outside of the view.

1. select all the wall you want to hide

2. click top menu " Display > Polygons > Backface culling"

3. Then the wall won't be seen from outside of the room, but if move inside, the wall will be seen.