Individual items can be returned from an account that is loaded into Circulate, when you have a large number of books to return, it is recommended (and may save you a lot of time) to use Multi-Return.
Find and load a Borrower's account into Circulate.
The 'Current Loans' table will show all resources the borrower currently has on loan.
Select the item to return from the Current Loans tab of the borrower's account and click 'Return' to return the resource. If you have the book to hand, you can instead scan the resource barcode label with the scanner or type in the book number into the Barcode box.
A notification will show at the bottom of Circulate, confirming that the resource has been returned.
Notice that the item is also gone from the Current Loans tab and now shows in the Past Loans tab.