If it is in your My Batches, Click Manage, Click on the box you want to return, Click on the Returned Selected Batch that will appear.
If you have the batch open, Click on the Batch tab, Click Return Batch.
Thanks to Dellory Matthews - Indexing videos:
13 minutes; Judy Sharp; BYU Family History Library; October 2019
54 minutes; Kathryn Grant; BYU Family History Library on 6/13/19