If you're using TurboTax Free Edition, and logged into the same account you filed your 2019 tax return, then your last year's TurboTax information will transfer over. However, if you're filing using the TurboTax Free File Program, this transfer feature is not available.
References:
What's the difference between IRS Free File Program and Free Edition?
How do I switch to IRS Free File Program delivered by TurboTax?
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