


Check the box next to "Use scroll gesture with modifier keys to zoom.".Click the Accessibility icon (the blue-and-white person icon).Click the Apple menu and select System Preferences.This makes it so you can press a key (such as Command) while you scroll up or down on the wheel/surface to zoom. If you're using a mouse that has a physical scroll wheel, a mouse with a multi-touch surface (such as the Apple Magic Mouse), or a laptop trackpad, you can use it to zoom and out in any window by associating a "modifier" key.

Enable the Scroll Gesture with Modifier Keys option.
