When I tap Settings, the window opens but I cannot hit the Done button to close it. I can force the App to quit to get things back to normal, on phones it works fine.
Answer: on iOS 13.4 : just select any field for editing, and the “Done” button (your way out) appears.
If you do not make any changes then the “done” button does not appear. You just need to know that the GUI is currently working that way with this ver iOS.