On the Messages dashboard, you can drill in to a list of users that opened a notification directly or indirectly via the Top 50 Notifications table:
A direct open occurs when a user taps a notification.
An indirect open occurs when a user opens an app after receiving a notification.
The count is based on the time range filter that is chosen.
|A user will appear in both lists when the user taps on a notification (counted as a direct open), and then at a later time opens the app (counted as an indirect open).|