Ok I feel foolish. I needed to be told on TG how to get to the preference menu. I had never thought to try pressing the Anchor logo.
1.add a conventional three-dot button in upper right that goes to the same “About” screen
2. add explicit text in “Help” page saying to press logo on main screen for more options
3. In the “unsafe action” warning given by updateauth, expand the “set your preferences” text with “… by pressing the Anchor logo on the main screen”
I may not be the only bozo out here who could be helped by one or more of these suggestions.