Thanks for sharing your concern and providing an additional screenshot, @Max Sales.
Yes, there is an option you can use to disable the Class drop-down list in the Sales Receipt window.
Simply turn off the class tracking feature in the Company Preferences section. Let me show you how:
- Go to the Edit menu and select Preferences.
- In the Company Preferences tab, uncheck the box for Use class tracking transactions.
- Click OK.

Please take note that disabling this feature will not only affect sales receipts, but to all of your sales transactions.
In addition, you can run the Transaction List by Vendor report in QuickBooks. This will show you the list of all transactions for each vendor. Just go to Reports and select Vendors & Payables. Then, click Transaction List by Vendor.
Just tag my name in the comment section if you have any other concerns or questions. I'll get back to you as soon as I can. Stay safe.