How to zoom in the screen of your iPhone, Mac, or PC

 [iOS] Zoom in on the iPhone screen (“Zoom Region” → “Window zoom” recommended)
https://support.apple.com/guide/iphone/zoom-iph3e2e367e/ios

[macOS] Zoom in and out on Mac (“Scroll to zoom” recommended)
https://support.apple.com/guide/mac-help/zoom-in-and-out-mchlp2975/mac

[Windows] Use Magnifier to make things on the screen easier to see
https://support.microsoft.com/en-us/windows/use-magnifier-to-make-things-on-the-screen-easier-to-see-414948ba-8b1c-d3bd-8615-0e5e32204198#WindowsVersion=Windows_10