Notification center
The Notification center aggregates all notifications that have been generated by the system for you as a user.
If you want to go to the Notification center, click on the Bell icon in the top panel and then on the Notification center button.
The Total tab contains a list of all unread notifications. Next to the label, you can see how many such notifications there are. Individual notifications can be marked as read using the check marks that are available at the ends of individual items. If you use the checkboxes, the Mark selected as read button appears. The last option is the Mark all as read button. If you click on it, all unread notifications will be moved to the Read tab.
The Last 24 hours tab contains a list of unread notifications generated within the last 24 hours. Next to the label, you can see how many such notifications there are. The available options are the same as in the first tab.
The Read tab contains a list of all read notifications. Next to the label, you can see how many such notifications there are. Individual notifications can be deleted from this list using the crosses that are available at the ends of individual items. If you use the checkboxes, the Delete selected only button appears. The last option is the Delete all button. If you click on it, all read notifications will be deleted from this list.