If you no longer need a Campaign in your account, you can delete it from the Campaigns page.
Please note that deleting a Campaign will permanently delete all Campaign data, and there is no undo for this action. If you think you may want to access this data again at some point, it may be a better idea to pause the Campaign instead.
To delete a Campaign, first navigate to the Campaigns page in the Account Settings section of the left navigation :
On the Campaigns screen, select the Campaign(s) you'd like to delete by checking the box for the appropriate row and click the Trash icon above the table:
Click OK on the confirmation box
The Campaigns have now been deleted from the account.