If your business return is for a Partnership, S Corp or C Corp then you had to use the TurboTax Business Edition software installed on your personal computer. You will have to start the TurboTax program and then print the return from within the software. TurboTax does not store online any returns completed using the desktop editions.
If your business is a sole proprietor that has not incorporated then your business was entered on a Schedule C which is part of your personal tax return, form 1040. If you used the TurboTax online editions for the 2020 return follow this procedure -
To access your prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/
Start the 2022 online tax return by entering some personal information then click on Tax Home on the left side of the screen.
On the Tax Home webpage -
Scroll down to the section Your tax returns & documents. Click on the Year 2020 and Click on Download/print return (PDF)