Stack layout arranges its children in 3D space next to each other in a stack on the selected axis. An object in the stack layout, takes space according to its bounding box (physical dimensions), but you can extend the virtual size of the object by using object-specific layout.
To create a stack layout:
You set the distance between objects by setting the properties of each object in a stack layout.
To set the distance between objects in a stack layout, in the Project select each object and adjust its Layout.Item properties. For example, to add space between objects you can set Layout Height, Layout Width, and Layout Depth properties to values that are higher than the height, width, and depth of the objects are.