How do I delete a "sale of business property" when there is no delete button?

You need to go back to your business entries, and on the screen that says Less Common Business Situations, choose the option that says Sale of Business Property:

 

Next, you will come to a screen that says Sales of Business or Rental Property, on which you need to edit the copy:

 

 

Then you should see an option to delete the property you sold: