Not all users of different types of systems are suitable for the standard text size and interface elements. Sometimes you want to make the text larger for readability, and sometimes vice versa – reduce the size to fit more elements on the display.
You may need to use text size when working on external monitors. There, all this can still be shown with Retina resolution.
The Cupertino team has addressed this issue and added the appropriate settings to iOS 15.
To the point: How to change text size on iPhone. Can be customized for each application
Now such an option will appear on the Mac in the new macOS Sonoma. You can install the first public test version and try out the new feature according to our instructions.
How to Change Text Size for Selected Apps on Mac
1. Go to System Preferences – Accessibility.
2. Open section Display and find the new menu item Text size.
3. Adjust the default text size using the slider.
4. You can resize the application for frequently using the drop-down menu.
At the moment, the option is an option in standard programs Calendar, Seeker, Mail, Messages And Notes. it is assumed that by the final release of the system it is supposed to support not only all standard, but also external applications.
Changes in this menu apply to the fly, for which you can open a custom program window nearby to see the result at a glance.
Source: Iphones RU

I am a professional journalist and content creator with extensive experience writing for news websites. I currently work as an author at Gadget Onus, where I specialize in covering hot news topics. My written pieces have been published on some of the biggest media outlets around the world, including The Guardian and BBC News.