You must right-click a correlated event in order to view the events that triggered the correlated event. In the event table from which you are selecting the event, look in the summary display panel on the right for an event that has a property of SensorType with a Value of C (C: correlated event).
To view events that triggered a correlated event:
In a Real Time Event Table of the Visual Navigator or Snapshot, or an Event Query table, right-click a correlated event and select View Trigger Events. A window opens showing the events that triggered the rule and the name of the Correlation Rule.