Hi there, Sandy Eggo.

I appreciate you for performing the troubleshooting details mentioned above and for coming back to the thread to share updates on your issue about deleting classes. With this, I'll ensure to you'll be routed to the right support team to assist you further so you can get back on track as soon as possible.

Since the issue continues to occur, I recommend contacting our QuickBooks Desktop Support Team. They have the tools to pull up your account in a secure environment which we're unable to do it here in the Community. This way, they'll be able to investigate the cause of the problem and remove the specific class on your end.

Lastly, you may refer to this article to see steps on how you can open Accounts Receivable and Credit card by class in QBDT for Mac: Filter, sort or total reports by Class.

If you need further assistance about managing your classes in QuickBooks Desktop. Please just comment down below. I'm always here to help. Have a great day!