Stack order controls how different geometries stack on top of each other.

The higher the number, the higher it stacks in the building.

Change the stack order to move the geometry up and down in the stack.

Stack order is not the same as “level.” It is relative to other geometries in the stack.

A geometry with 1 level can be stack order 1, A geometry on top of that may have 4 levels, but it is stack order 2.