Did you know that since iOS 15, you can set the text size on an app-by-app basis?
The ability to increase or decrease the text size system-wide is an accessibility feature that came with iOS 7.
Up to iOS 13, the only way to change it was to visit Settings > Accessibility > Display & Text Size > Larger Text
With iOS 14, Apple introduced a "Text Size" button in Control Center which simplified the process of changing that parameter globally.
But, this chosen text size would be the same across all apps and the operating system.
Since iOS 15, the same "Text Size" button now gives us a toggle to set a chosen text size either for the currently active app or the entire system.