Instructions
Open up Facebook in your Internet browser. Click on the "Restaurant City" application to load up the game.
Click on the "Redecorate" button at the bottom of the window.
Click on the window that you would like to float in mid-air and pull it away from the wall.
Hold down the "Ctrl" button on your keyboard and drag the window to the location where you would like to place it in your restaurant.
Release the left mouse button and the window will now be floating in the air.