The Slide Aside feature is native to Android based LG smartphones such as the G Flex, G Flex2.... It is a multitasking panel allowing you to run use multiple apps at the same time (3 finger swipe to switch app screen).
To enable or disable the Slide Aside feature:
- Tap on the Home button > Menu
- Go to xSystem Settings > Multitasking
- Toggle Slide Aside on/off.