Reordering Nonconsecutive Selections
When you apply the Bring Forward or Send Backward arrangement command to
noncontiguous selected layers (Command-click to select noncontiguous layers), the layers
move up or down the object hierarchy together, and any space between the layers
remains.
Nonconsecutive layers selected
Bring Forward command applied
When you apply the Bring to Front or Send to Back arrangement command on
noncontiguous selected layers, the layers move up or down the object hierarchy together,
and any space between the layers is removed.