The Action Inspector data is selection-scoped, and displays note $DisplayName for the currently selected item; if more than one item is selected it shows the number of items in the selection (e.g. 'Visual Styling' for a single note of that name, but 3 notes selected shows '3 Notes').
The Action Inspector has these sub-tabs:
- Query Inspector
- Action Inspector tab
- Rule Inspector
- Remove Inspector
- Other Inspector
- Edict Inspector
- Sort Inspector
See also—notes linking to here: