Event History
The Event History tab serves the same purposes as the standalone Risk History widget.

note
Event History is only available for event types where a Stream Type of CRUD has been configured in Authoring. History is generated only after changes occur to the underlying data.
Once available, Event History must be ingested separately through the Workstation Data Ingestion screen before it can be viewed in Workstation.
The History tab in an event's Object Details Viewer appears only when history data exists for that event.