Add Campaign Members Faster

Your marketing team can now quickly select, search for, and add leads, contacts, and person accounts to campaigns without leaving the campaign detail page. Previously, when users added leads, contacts, or person accounts, they were sent to the Leads or Contacts home pages, taking them away from the campaign details. This change applies to Lightning Experience only.
The Add Leads to Campaign window

From the Campaign Members related list, click Add Leads or Add Contacts. A window displays the Recently Used list view. Click Add Contacts to add person accounts.