Apple Motion 5.1.1 - Manual (Page 155)

Chapter 6 Create and manage projects 155
For example, when you select a group that has three layers nested in it, the entire group is
selected as a single unit.
Moving a selection in the Canvas moves all three layers simultaneously.
After moving group Before moving group
Regardless of how they’re nested, layers can always be animated independently. Subordinate
groups can also be animated independently. In the following example, a filter is applied to a layer
in a group containing three fish layers. All other layers in the group remain unaffected.
67% resize factor