On iPhone or iPad:
Launch Settings > Display & Brightness. From there you can tap on the Text Size menu option, and then slide the slider at the bottom to your desired text size.
For bold text, you’ll need to launch Settings > Display & Brightness. From there, you can toggle Bold Text on or off. Note that turning it on or off will require a reboot of your iPhone or iPad.
On Apple Watch:
On the Apple Watch, launch Settings > Brightness & Text Size, select Text Size.
Use the Digital Crown to adjust your Text Size larger or smaller.
For bold text, launch Settings > Brightness & Text Size. You’ll need to reboot your Apple Watch if you’d want to turn this feature on or off.
