Thank you for dropping by, @lyndaj.
I'm here to share why you're getting this pop-up message and how you can remove it when creating checks in QuickBooks Desktop (QBDT).
A pop-up window appears to let you add a class when recording checks in QuickBooks when the Prompt to assign classes on either of your Accounts, Items, and Names is turned on under the Company Preferences. That said, you need to turn it off to remove the message.
Here's how:
- Select Preferences from the Edit menu.

- Click on Accounting at the left pane, then go to the Company Preferences tab.
- Uncheck the box beside the Prompt to assign classes section, then tap OK.

That's it. You'll now be able to write a check seamlessly without any notification to add a class.
You can also open the links from this article for additional guides about managing checks in QBDT.
You're always welcome to come by the Community if you have additional concerns. It's my pleasure to help. Keep safe!