The easiest way to delete a form in TurboTax Windows is to switch to the Forms view (Ctrl+2) and search in Open Form to find the form you need to delete (Schedule C or Schedule E). When the form you want to delete populates on the screen, click Delete Form at the bottom of the screen (if there are any subforms or worksheets associated with the forms, delete them first, then the main form).

Please comment if you need additional guidance with this.