Was the mortgage interest paid greater than the standard deduction for your filing status? If not, then the Standard Deduction will be used and not the Itemized Deduction.
Standard deductions for 2019
If you have greater deductions than the standard deduction it makes sense to itemize. If you are married filing jointly you would need $24,400 in itemized deductions (That would be a lot of paid interest) to make it a better choice.
How do you declare a standard deduction when you have been filing jointly and itemizing before on turbo tax
Whether filing joint or separate if you don't have enough deductions to exceed the standard deduction or don't want to itemize, then on the "Deductions & Credits" page click "Wrap up Tax Breaks" at the bottom of your page. You will come to a page that compares your standard deduction to your itemized deductions and you can choose which you want to use.