To identify duplicate items in your Library, follow these steps:

1. Navigate to the library or folder that you want to deduplicate.
2. Slide the Show duplicates slider to the right. This may process for a few seconds.
3. Sort items by Title by clicking on the up or down arrow next to the Title column heading.
4. You will see duplicate items grouped by title.

You can then use the Move/Export/Delete button in the top menu to move duplicate items to another folder, or delete them.