How to enable Pin window in Samsung Galaxy A7-2016(SM-A710FD)?

You can Pin an application to the screen of your device. This feature locks your device so the person using it has access to only the pinned application. Pinning an application also prevents other applications and features from causing interruptions, and it keeps you from accidentally exiting the application.  

Navigate to Apps → Settings → Lock screen and security → Other Security settings → PIN windows → Enable PIN windows 

Pictorial representation for changing the above settings is as follows:

a). Tap on Apps icon from the Home screen.

b). Tap on Settings icon.

c). Select and tap on Lock screen and security settings.

d). Tap on Other security settings.

e). Drag the Screen upwards to access more options.

f). Tap on Pin windows.

g). Tap on the Switch to enable Pin windows.

CLICK HERE to know how to set Notification alert for applications in Samsung Galaxy A7-2016 ( SM-A710FD ).