Hi there, @SCarl. The Class column will not show in the Bank Deposit if the Class tracking feature is turned off. Let's review the settings to ensure that this tool is active so we can restore the missing field.
Please see the attached image.

Also, class tracking is exclusive to QuickBooks Online (QBO) Plus and Advanced. If you have one of these versions and the feature is enabled but not appearing, let's refresh your browser using the Refresh icon, pressing F5 (Windows), or Command-R (Mac).
Once refreshed, check to see if your data reappears. If the issue continues, please log out of your account. Wait a few moments, then sign back in.
To enhance your experience with QuickBooks, our QuickBooks Live Expert Assisted team is available to help you manage classes and locations.
Please don't hesitate to leave a comment below if you have further questions. I'm here to help.