How do I access old tax returns and worksheets? (I've done this in the past, but don't see that menu option currently). Specifically, my 2019 tax owed calculation.

I need do amended returns for 2019 & 2020 to include QOZ deferrals and form 8997 that TurboTax does not support. I started the 2019 1040X, but don't know how to calculate the new tax owed.