Child Arrangement property
Child arrangement determines how the contents of a container are arranged if the container has extra space.
This setting is disabled if the width and height of a container is auto-sizing. Auto-sizing tells the container to expand to the size of the elements it contains. Since that allows no extra space, child arrangement properties have no meaning, and are disabled. To enable child arrangement, set the container’s width in pixels, or to stretch.
When a container has extra space, you can select one of the following to influence how space is distributed:
Start—Contents are distributed to the start of the container.
Center—Contents are distributed to the center of the container.
End—Contents are distributed to the end of the container.