See https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/get-copy-2020-return-filed-turbotax-online/L0uh9Z123_US_en_US
and
https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/print-download-return-filed-year-turbotax-online/L9UFCwxDQ_US_en_US