This feature is available in Enhanced Vision controllers.
Except for variables, which cannot be placed one on top of another, the elements in a display are shown in layers according to the order in which they were drawn. The last element is on top of the others.
You can change this order by using the arrows in Draw Order.
In the next image, Rectangle 1 is on top of Rectangle 2.
In the next image, Rectangle 2 is on top of Rectangle 1.