Target List

The box contain list of affected target object or bone.

By default it uses Selected, which will insert all selected object or bone into the list. Ignored if object type is either CURVE, GREASEPENCIL or ARMATURE. This is recommended if you're using annotation.

Using List allows you to manually select target object or bone. Unlike Selected which doesn't append both object and bone at the same time depending on the context mode, List is capable of having both object and bone regardless if you were no longer in pose mode or whether the object is no longer selected. This is recommended if you're using grease pencil or curve.

List have three operation:

Add: add all selected object into the list
Remove: remove selected entry from the list
Substitute: remove all entry, and then do the same operation as Add