How to enable the "Allow Peeking" option on Lollipop? I have recently upgraded my Samsung Galaxy N3 (SM-N9005) to Android 5.0 in the hope that I would get the heads-up style notifications. According to online resources I have found, this option is called "Allow Peeking" and is found under the notification options for each app. 

However, when I go into the notifications for the apps I have installed, none of them have the "Allow Peeking" option.

Is there something else I need to enable? If not, how do I get the "Allow Peeking" to appear?
"Heads-Up" Notification is introduced in Android Lollipop. However you can only disable the feature by updating to Marshmallow. Marshmallow has the option for disabling Heads-Up notification so-called "Allow Peeking".

Below is the screenshots for Lollipop and Marshmallow.



App notifications on Lollipop



App notifications on Marshmallow