Control Who Can Access Campaign Members
Where: This change applies to Lightning Experience, Salesforce Classic, and all versions of the mobile app in Professional, Enterprise, Performance, Unlimited, and Developer editions.
How: To let users see only the campaign members whose lead or contact records they have access to, in Sharing Settings choose Controlled by Lead or Contact. To let users who have access to a campaign see campaign member details, choose Controlled by Campaign.
Access provided by a user’s role or profile supersedes the organization-wide defaults.