Use the Suspend action (from the Actions menu) if they need to suspend a running Campaign, for example, to make modifications to the Campaign configuration, such as its audience or Strategy.
Suspending a Campaign prevents any upcoming runs from executing. When performing this action, the marketer must enter a note.
Upon completion of this action, the system transitions the Campaign back to the design stage and notifies the user who launched the Campaign that it has been suspended. The notification email contains the marketer's note and a link to open the Campaign.