A 2019 federal amended tax return, Form 1040X, can either be printed and mailed or it can be e-filed.
See this TurboTax support FAQ for amending a 2019 tax return originally completed and filed using TurboTax - https://ttlc.intuit.com/community/tax-topics/help/how-do-i-amend-a-2019-return-in-turbotax/01/123845...
