@DoninGA I signed in to my active account in an Incognito mode window to eliminate the possibility of cookies or other settings causing problems. TurboTax gives me a "Welcome back..." message followed by
"We're saving you time and improving accuracy by pulling all of last year's info..."
which confirmed that some part of the system remembers me, and has the information I entered into my tax return. Going to Intuit Account -> Products & billing shows my product as TurboTax Online.
I found when poking around more, that clicking on TurboTax Online 2019 took me to a product card. Expanding that showed "Tax returns and documents". Clicking that logged me back into a turbotaxonline.intuit.com account (not either of my login accounts) which has a documents tab, under which is a View documents from: option. Selecting 2019 and clicking Download tax PDF pops up a series of dialog boxes that still would not let me get a copy of my return until I answered a collection of nosy questions that are none of their business, anyway.
After 3 frustrating hours, support documentation that does not in any way resemble the actual screens, dealing with the most ridiculously stupid phone support system, your suggestion got me half-way to the answer where I finally got my document. Thanks for your help!
