Use your trackpad to zoom in to make an image larger on Mac
You can use your trackpad to zoom in on part of the screen.
On your Mac, choose Apple menu > System Preferences, click Accessibility, then click Zoom.
Select “Use scroll gesture with modifier keys to zoom” to turn on zooming.
Choose a modifier key (Control, Option or Command) to use to zoom, or press a combination of them together.
Set additional zoom options:
To make zoomed screen images appear smooth, click Advanced, click Appearance, then select Smooth images.
To make the zoomed image shift to follow the cursor, click Advanced, click Appearance, then select Follow keyboard focus.
To choose the type of zoom to use, click the Zoom style pop-up menu, then choose Full screen or Picture-in-picture.
Press and hold the specified modifier key or keys, and scroll using the trackpad to enlarge and reduce the screen image.