Dismiss alert notifications
If you no longer want an active alert notification to be displayed on your Alerts menu, you can dismiss a single notification, a group of notifications, or all notifications.
A dismissed notification is removed from your Alerts menu for a 24-hour time period. If the condition resulting in the alert remains in an alerting condition for more than 24-hours since it was dismissed, the alert is reactivated and a notification is sent again.
How to dismiss alert notifications
If you have Push Notifications enabled, an alert notification is displayed on your mobile device lock screen. To dismiss an alert notification from the lock screen, swipe the notification to the right.
From the Alerts menu, you can dismiss a single, group, or all notifications. To view your active alert notifications, go to the Alerts menu, tap 
(Alerts menu).
To dismiss a single notification - swipe the notification to the right and tap Delete. The alert notification is removed from your Alerts menu.
To dismiss a group of notifications - from the group of alerts displayed, tap 
(dismiss icon).
To dismiss all active alert notifications - from the top left area, tap (dismiss icon).