Should classes be populating on receipts if listed in the product settings?

I'll help you ensure you're able to populate classes in your sales receipts, info1971. 

Please make sure you have turned on the class tracking feature in QuickBooks Online. Moreover, it's important to note that the information displayed in QuickBooks will based on the Square app setup. It would be best to contact their customer support team for further assistance in checking the configuration settings of your Aquare account.

Here's how:

1. Sign in to your QBO account.
2. Select the Apps menu from the left panel.
3. Go to the Find Apps tab.
4. Search the square app you use.
5. Open the app in the lower right corner, then check the contact support information.

You'll want to monitor classes in QBO. Read this article: Run report by class in QuickBooks Online.

Kindly get back to us if there's anything else you need to know about Square importation to QBO. I'll respond to you promptly. Keep safe.