Campaigns can be deleted if they are no longer used. Once a campaign is deleted, it can no longer be launched. Additionally, all launched target accounts in the campaign will no longer be available for retrieving to your other systems.
To delete a campaign, go to the Campaigns page in D&B Lattice. Find the campaign you would like to delete. Click on the three dots on the upper right side of the campaign card and click on "Delete," as shown below.