LG V20 User Manual page 8

Expandable notifications
When a notification comes in, tap the expandable view icon to view the
notification.
Direct reply
When you receive a notification, you can reply to the recipient from the
Second screen without closing the current app.
When the notification comes in on the Second screen, tap the arrow icon,
tap REPLY, then reply to the recipient.
Custom-designed Features
Expandable view icon
Second screen
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