If you can't clear it because you paid you will have to try and delete the 2019 entries manually and enter the real 2020 info.
Or you can leave this account and set up a new account to do 2020. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
Since you already paid ask customer service if they will give you the 2019 Desktop program or at apply it to another online account for 2020 or get a refund.
