Reading Notifications
Marking a Notification as Read
To mark a notification as having been read in the Notification full screen:
Click the
icon
at the top right corner of the screen. 
In the Notifications drop-down panel, scroll to the bottom of the panel and click View All
.
When Notifications tab opens, select the multi-select checkboxes of the notifications in which you are interested, and select the Mark as Read button.

NOTE: The following bulk actions are temporarily unavailable.
To mark all notifications listings as read, click the Mark All as Read button
at the top right of the screen's listings.To delete all notifications, click the Delete All Notifications button
at the top left of the screen's listings.
To exit out of the full screen Notifications, click one of the screens from the sidebar.