CUSTOMIZE INPUT DEVICES AND SHORTCUTS
01 MOUSE GESTURES
In the Magic Mouse tab, click Add New Gesture. Click the pop-up menu under Magic Mouse Gesture (near the foot of the window) to see what’s available. One of the best extra gestures to trigger is the 3 Finger Double-Tap.
02 CHOOSE AN ACTION
From Three Finger Gestures, choose 3 Finger Double-Tap. From the Predefined Action, choose Application Switcher in the OS X Functionality group. Double-tap your Magic Mouse with three fingers; the app switcher should appear.
03 EDIT YOUR GESTURE
What you define is customisable. In the list of configured gestures above, click the one you just created. Now that’s selected, you can pick new options from the menus in steps one and two – try the 3 Finger Tap and Start Siri settings.