Have a lot of campaigns and don’t need to see them all? Remove campaigns from your organization’s list by archiving old ones. Life is a bit better with reduced clutter.
Once we’ve figured out how to organize the rest of life, we’ll let you know.
In your Campaign list under your organization, you have an option to ‘Archive’ campaigns in the cog/gear menu of that campaign:

Archiving does NOT delete the campaign. It merely removes it from your visible list so you can organize your current campaigns. See this article for how to delete your campaign and why you may not be able to yourself.