Campaign history will show what actions you, or your team, have made on a specific campaign. For example, the date a certain user added a search into the campaign.
To find your campaign history you should follow this guide:
Select the campaign you wish to find out about
Select the tab at the top which says History
You can now view the history of the campaign including viewing the list of users which were added into the campaign
If you have any questions please let us know via the live chat or email firstname.lastname@example.org!