This might seem a bit complicated, but this does get you pass the wall limit in creative.
You will need:
Barriers(devices) 4x or any number of barriers you need
Terrain
All you need to do is have your little room with any floor, and you can use floor to make a wall. Outline the inside of the room. Now, set the Barriersâ settings to Visible in Game as NO. Cover the âwallâ with the barriers so that you can not exit the room even though your supposed âwallâ is not even a wall. There! You can bypass the wall limit like that!