I'll make sure that you'll be able to turn off the warning message, MRusty.

I've tried turning off the option that warns users when a transaction isn't assigned a class. and was able to view the checkbox. It could be that the accumulated temporary internet files in the browser are preventing you from viewing this interface. To isolate the issue, you can open your QuickBooks company using a private or incognito window. This mode doesn't save cookies and site data. Here are the keyboard shortcuts:

• For Firefox or Microsoft Edge, press Ctrl + Shift + P.
• For Chrome, press Ctrl + Shift + N.
• For Safari, press Command + Shift + N.

If you're now able to view and untick the Warn me when a transaction isn't assigned a class checkbox, head back to your regular browser and then clear its cache to delete the stored junk files. Switching to other supported browsers can also help fix the issue.

Additionally, here's an article that will help you monitor how each segment of your business is doing: Run reports by class. 

You can always find me here if you have follow-up questions about class and location tracking. Have a good one.