Select the Accounts Receivable tab under Billing

We recommend expanding the view to 2000 rows per page

Select all accounts (or specific accounts) and select Apply Credit

This will apply any unused account credits to any unpaid invoice for that customer.

To locate all accounts with account credit -

Billing > Accounts Receivable

Select the funnel next to 'Account Credit'

If you filter by 'Is Greater Than' and enter 0 this will show you every account credit available.