I bought a property that has my home and a separate rental cottage on it. Do I enter all mortage interest from Form 1098, or half since I only rent half the property?

TurboTax says to enter all mortage interest and it will allocate my personal portion over to the deductions section. But Iʻm concerned that itʻs assuming I rent the entire property for which I have a mortgage (I only rent out the rental cottage - not my home