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/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
Or -
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 State on the left side of the program screen.
Under No circumstances change anything on the tax return that was filed. Just view what was entered.
If you are required to change the state tax return and send it to the state then you Must amend the tax return that was filed. Do Not change the original tax return.
See this TurboTax support FAQ for amending a state tax return - https://ttlc.intuit.com/community/amending/help/i-need-to-amend-my-state-return/01/26510
