Zoom and center selected portion of screen on MacOS The presenter in the video at https://developer.apple.com/wwdc18/407 does something fabulous with zoom on MacOS that I cannot figure out. He selects a portion of the screen (similar to the way you can select a portion of the screen to take a screenshot) and then zooms and centers on that selected area.

He does this several times. The first time is at about 13:35, though the selecting action can be difficult to see. It is much clearer when he does this at 17:22.

I've spent a good deal of time on Google to no avail. I can find no third-party software that adds this functionality to the system, either.

Is this a Mojave thing?
This is not exclusively a feature of macOS Mojave. This is an old, built-in feature from OS X.

Navigate to:


System Preferences → Accessibility → Zoom


Set Zoom Style to  Picture-in-picture .

You can adjust the coordinates of the selected portion by clicking  More Options...  →  Adjust Size And Location .