Source: "http://acer--uk.custhelp.com/app/answers/detail/a_id/34681/~/how-to-use-acer-quick-mode-on-acer-smartphones"
Turning Quick Mode off
1. Swipe down from the top of the screen to open the Notification area.
2. Tap the Settings icon in the lower right-hand corner of the screen.
3. Set a passcode if you have not previously set one.
4. Tap OK.
5. Tap the Settings icon in the lower right-hand corner of the screen.
6. Tap Exit Quick Mode.