This would be very helpful. I see people requested this years ago, surprised this has not been added. Just like you see a balance due, you should be able to see a credit balance.
Add a "Client Credit" button in Clients and Agenda (when applicable) identical to the one already displayed in Ledger. This would make it easy to spot client credits at a glance across the caseload, especially when viewing the Clients page. It would help identify standing credits more consistently and reliably for monthly billing processes.