Nothing is fixed to the walls. Each section has two legs at one end and is bolted to its mating section at the opposite end. With the exception of that left side section over the dresser, that also has the short leg resting on the dresser at its opposite end. All the legs are fitted with leveling feet, the type that screw in and out.
The backdrop is supported by 2x4’s screwed into the back of the sections frame.