Tap on the 'Book' section to see and redecorate your previously completed rooms.
Click the 'View' button to open the room. Then, tap and hold the screen to see the item icons.

Click on the item icons to change the decorations. If you want to take a screenshot of your room, you can close the icons by clicking the green button under the screen. Click the red button to go back to your Book.

Learn more about Mergedom: Home Design merge puzzle game.