There Should be 3 layers Accessible through the deco layer menu and u can switch between 3 layers 1st of course is the particles 2nd are the walls and 3rd would be the background
@THElagB3AST It originally did deco the background, then it was changed to limit it elements-only. Wall deco was also rejected I think, because the deco would be in a 4x4px block every time(one wall block would have only one colour)