Samsung SM-G960W User Manual page 148

Apps and features
Notification pop-up windows
You can quickly view the content of a notification and perform available actions from the
notification pop-up window. For example, if you receive a message while watching a video or
playing a game, you can view the message and reply to it without switching the screen.
When a notification pop-up window appears, drag it downwards to view the content.
This feature is only available to apps that support the Multi window and edge lighting
features. To view supported apps, launch the Settings app, tap Display →
Edge screen → Edge lighting → Manage notifications.
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