To check for duplicates in your library:
- Click on Library and then Find Duplicates.
- If your library contains duplicates, two references will be displayed at a time side by side. You compare them and then click on Keep this Record to save one of these references. The reference that was added earlier to the library will always be displayed on the left side.
- When you save one of the duplicates, the other is deleted. If the deleted version was in a group without its duplicate, it disappears from the group.