Disallowed section 179 deduction - Regular Tax and QBI deduction

Where can I find regular tax disallowed section 179 deduction for years 2018, 2019 and 2020. I checked my previous years' tax returns and can only find QBI deductions (not regular tax disallowed)?

On my 2021 tax return, Turbo Tax needs me to provide information for the past three years in the following categories:

Regular Tax - Disallowed section 179 deduction

QBI deduction - Disallowed section 179 deduction