You cannot delete the for 4797 for a rental real estate at all. If you delete, it comes back.
The rental property "SALE" is reported in the "Rental Properties and Royalties" section, but the result shows up in "Business Items". There it is in "Sale of Business Property" and had the button to Update if you need to edit. BUT, here is the fun part, you cannot do anything using this 'Update" button. . Even though the number shows up here you actually have to go to the Rental section to update the numbers here. If you uncheck the sale of the rental property, the form 4797 will disappear.
Talking about counter intuitive !. It took hours of trial and reading to figure this out.
