How to access 2020 federal tax inputs?

TurboTax would not have any receipts for the expenses or deduction you claimed.  Those are your responsibility to maintain and to have available if ever questioned by the IRS or your State.

There are worksheets included with your tax return based on the information you entered in the TurboTax program for your tax returns.

To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state. 

This will take you back to the 2020 online tax return.

Click on Tax Tools on the left side of the online program screen.  Then click on Print Center.  Then click on Print, save or preview this year's return.  Choose the option Include government and TurboTax worksheets