2020 Amended Return - TurboTax doesn't allow me to select a return to amend

I got a revised 1099-DIV and I'm trying to do an amended return. I start TurboTax Premier 2020 (Macintosh - downloaded version) and, with no return open, click on "amend a return…" from under "Manage Your Returns". I answer a couple questions and then it takes me to "What do you need to change on your return?" and it lets me input the new info. It, however, never asks me to select what return I want to amend, so I'm at a complete loss as to how that would work. 

 

I've also tried starting out with the original return open, but I don't see a way to amend it from there.

 

I went back to the 2019 version of TurboTax to see how it dealt with amending a return and it does the same thing - never asks what return I want amended.

 

Is there something wrong with the application, or at least an issue with it on my computer, or am I doing something wrong? Any suggestions would be appreciated.