Room backgrounds are a background element between your Game background and your gameplay objects. They can be used to add accents to the design of your game, or to create the visual effect of entering into a room.
To place a room background:
1. Tap the Room Backgrounds button under the Decorate tab.
2. Select which asset you wish to add to your game as a Room Background.
3. On your layout viewer, tap where you want to place your Room Backgrounds asset.
You now have Room Backgrounds in your game!
For more help with Backgrounds watch this tutorial video.