If you used the Desktop CD/Download program on your PC then the only copy is on that computer and any backups you made. Not stored or saved online. You should have saved a pdf file when you were done last year (and even if you used the Online version). If you don't have a pdf file you should have the tax data file ending in .tax2019. The files should be in your Documents in a Turbo Tax folder.
If you can't find a copy, You can request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript
