This article explains how to enable Zoom on a Mac and how to use its advanced features. It also includes information on how to use Zoom on iOS devices.
iOS built-in magnifier
Zoom is an accessible screen magnification tool available on all macOS and iOS products. On Mac devices, Zoom can magnify on-screen content (including text, images, and video) up to 40 times its original size. Follow these steps to enable and edit basic Zoom settings on macOS.
Go to System Preferences > Accessibility.
Select Zoom under Vision in the left menu.