Your suggestion is interesting. I checked the accessibility settings and found that nothing had been changed from the defaults. The Larger Text setting under Accessibility was Off with the radio button not showing as a result. However, inspection the sign-in page and a comparison with an iPhone 12 made it apparent that the font size in use is larger on the iPhone 13 Pro in question. So I think you are correct in your suggestion as to the source of the issue with the App being derived from an overall phone setting, but I don't know where that is coming from. Again, things are fine in the iPhone 13 Pro simulator. Thanks very much for the pointer. I'm an hour from the nearest iPhone store, and don't have access to another iPhone Pro, but I now figure I know where to start tracking the issue down, and I hope it isn't with my App, but rather is an issue with this particular iPhone.