Can’t activate the Multi window feature

A : If you cannot activate the Multi window feature, please check whether Easy mode on device is enabled or not. 

Easy mode lets you use your device with a simpler home screen layout and straight forward application interactions, but it limits some of the features available.
As a result, if Easy mode is enabled, you can’t use Multi window feature

[How to check whether the Easy mode is on or off]

1.In the settings area of the device tap on “easy Mode”

2.Tap here to enable (or if enabled, disable) Easy Mode

※ Easy mode lets you use your device with a simpler home screen layout

※Please note:

When using Easy mode it is still possible to have the home screen set to the normal Touch Wizz Home, and not the Touch Wizz easy home screen mode – which can in some cases lead to misunderstanding as the device may at first glance to appear to not be in Easy Mode, when is actually is.

[How to change TouchWiz Home screen mode] 

1.Tap “Easy Settings” .

2. Tap "More Settings".

3. Tap "Default applications".

4. Tap "Home" to change home style.

5. Tap "TouchWiz Home".