Idea Summary
Allow grid style edit of affected items for dynamic actions.  At present when many items are affected the developer needs to search and pick each item individually and is unable to see (easily) which items have already been selected.  A grid style edit component showing which items have been selected and which ones are available for addition would be very helpful and efficient for managing multiple affected items.

Use Case
When creating or editing dynamic actions that affect multiple items on a page.

Preferred Solution (Optional)
Add a grid style edit option showing which items have been selected (e.g. by filter) and which can be added or removed from the list.