Solved! Go to Solution.
Select the "Email Marketing" tab near the top of the page. Click on the "Remove" link just below the row of tabs. From the list of emails select the ones you want to remove and click on the "Remove" button.
Any email campaign, include draft campaigns, can be deleted. This is beneficial for clearing up your Campaigns page, but also note that any deleted campaigns can be restored as well. Click here to learn more on how to delete your campaign.