When a campaign ends, its page now opens on a Report. The board is still a click away.
The report starts with a one-line summary of how long it ran and how much it published, then the totals for impressions, engagements and engagements per post. Below that are the best post, the best network and the best format, a few notes on what stood out, Orb's analysis, and everything the campaign published. If some posts never went out, the report says how many and links back to the board.
A campaign that's still running has a Campaign analytics panel with how far through it is, what's still to go, and its top posts so far.