How can I archive or pause a campaign?
I want to delete a campaign or change its status. How can I do this?
In order to delete a campaign, please change the status to “archive” in the “Campaign” tab in Discover. You can also pause or reactivate a campaign in the same way.

Can I somehow completely delete the campaign?
The campaign is basically “deleted” when you archive it. That's the most that Amazon offers at this point. It no longer appears in BidX, but can still be found in Seller Central if you search for it within the archived campaigns.