The list in the "Custom Animation" window calls all objects as "shape".
It is extremely difficult to say which object we are talking about.

Instead, the list should mention the shape of the object, followed by a sequence
number.

Example: A list could look like this:

Diamond 01
Right arrow 02
Circle 01
Rectangle 02
Callout 01
.....
.....

This list would make much more sense.

Of course, there is already a suggestion that if a user selects any entry in
thelist, the object should be selected in the main slide. That suggestion will
go nicely with this.