Are you using the Online version or the Desktop program? For Desktop you need to launch the 2019 program, not 2020. Or is it asking to transfer a 2018 return into a new 2019 return? If you have the 2019 program go up to File-Open.
Access a prior year online return
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/00/270...
Actually if you used either Online or Desktop you should have save a pdf copy of your return so you don't need to use the program or go online to get a copy.
