No Pinch-To-Zoom in the Mirror Tool
Why can't I pinch to zoom in the Mirror app? The Mirror app is a live view of the screen on your computer, not an image. Therefore, it's not possible to pinch to zoom in and out on the displayed window.
Adjusting the Loupe's Zoom Setting
How do I change the zoom size of the Loupe? You can change the zoom size of the Loupe by opening the Loupe menubar item and selecting from the 200%, 400%, 800%, and 1600% magnification levels.
