To view when a Case was last modified, head over to the Case Card, Details-view, and scroll to the bottom of the Card.
Below the Case Budget section, the Last Modified detail will then appear as below.
This will show the date and time when the case was last modified, and by who.
1. Only Users with access to the case will be able to see this.
2. The Last Modified status will appear last if the case is not closed. If the case is closed, the Last Modified status will appear above the Closed status.