Thank you for your reply. Applying a credit leads the negative balance to double, so that doesn't resolve the problem.

Here is what I have now on the Customers page:

At the top of the page: -$285.00 OPEN, $0.00 OVERDUE

11/07/2021, Balance -$142.50, Total -$142.50 (this is the new credit memo)

06/17/2021, Balance $0.00, Total -$142.50, Status Closed (client payment)

06/10/2021, Balance $0.00, Total $142.50, Status Paid (invoice)