Thanks for getting back to us and clarifying your concern, @paperdodo1.

I'm here to help make sure you can stop using the inactive class when creating transactions in QuickBooks Desktop (QBDT).

I've tried inactivating a class on my sample company file, and I can no longer see the class when creating a transaction. In your case, it's possible that your company file had a data issue that's why the class still shows after inactivating it.

To get this resolved, let's run the Verify and Rebuild Utility tools. This will help us isolate data issues on your file. 

To run the Verify Data utility:  

1. Go to the File menu, then select Utilities. 
2. Click Verify Data. 
3. If there are issues found, you’ll be prompted to Rebuild Now. 

Here’s how to run the Rebuild utility:  

1. Go to the File menu, then select Utilities. 
2. Choose Rebuild Data. 
3. Click Ok on Rebuild has completed.

Once done, you shouldn't be able to see the inactive class when creating a transaction.

You may want to run and customize reports by class in QBDT. This article will guide you through the steps: Filter, sort, or total reports by Class.

Come back to this post and let me know how the troubleshooting goes, @paperdodo1. I want to make sure you're taken care of.