You will have to delete any Home Mortgage Interest Worksheets or Form 1098:Mortgage Interest Statements that have gotten in your tax file, whatever the reason.
(I have seen this problem in some other posts. Some are there because the customer paid off a mortgage, but the form or worksheet has been carried over from earlier years. For others, it is hard to say how the mortgage interest question got started.
See: How do I delete forms in TurboTax Online?
After deleting these worksheets and forms, log out of the program. When you log back in, use the Delete a Form tool (List of Forms in My Return) to confirm they have been removed from your return.