Slide Aside allows you to quickly switch between three open applications (or tasks) using a three finger gesture.
Note: Up to three apps can be minimized to the left of the screen. Must use three fingers. Additional fingers, fewer fingers, or palm is not recognized.
From the Home screen, tap Apps > Settings > Slide Aside <
Tap the Slide Aside switch to enable.
While an application is open, place three fingers on the screen and slide to the left. The current screen is saved and the Home screen appears.
To re-open the saved apps, place three fingers on the screen and slide to the right. Tap the desired app you want to open.