The Stack Spacing variable controls the additional padding between children when a container uses a Children Layout of either Top to Bottom Stack or Left to Right Stack. Stack Spacing serves as an alternative to adjusting the position of each item in a stack.
A larger Stack Spacing value increases the spacing between each child. By default Stack Spacing is set to 0 which means that no spacing is added between items in a stack.
Changing the stack spacing adds gaps between each child as shown in the following animation.
Stack Spacing can also be a negative value resulting in overlapping children. The items in the following animation are partially transparent to show the overlap.
Stack Spacing can be used for either Top to Bottom or Left to Right Stacking.
Stack Spacing can be used on container instances which stack and wrap their children. As stack spacing increases, the amount of space allocated to each object also increases, resulting in wrapping occurring earlier.
If wrapping occurs, then stack spacing applies spacing between rows and columns as shown the following animation:
