It is in the same TT file as 2019 Federal. Just keep scrolling down, past some worksheets.
You can access your prior year returns using the Documents tab in the navigation.
If you filed your 2018 taxes with TurboTax, and would like to receive a copy to complete this year's tax return, please click, How do I access a prior year return?
If you did not file your 2018 taxes with TurboTax, and would like to receive a copy to complete this year's tax return, please click Can I get a copy of my tax return from the IRS?