This changes the overall Dynamic Text setting in iOS, which causes Apple apps and supported third-party apps to dynamically update their text settings, adapting to the text size selected.

How to change text size in Safari on iPhone There are a couple of ways to increase or reduce text size in Safari on your iPhone. Here's how By Henry Burrell Contributor, Macworld OCT 23, 2019 12: ...

Close out of Control Center and your font adjustments should update automatically. To increase the font size in any other apps, follow the same steps.

Upsizing the default text size on the iPhone is surprisingly common — a study from a software developer recently found that 20% of sampled users use larger text. Only 7% of users with eagle eyes ...