It is important that you first understand the hierarchy of a campaign.
Campaign > Adsets > Ads
In the analysis tool we made it so you can specify which level you want to focus:
The Campaign Level
Focusing on a campaign level would show general data on the whole campaign, this is good if you just want a general on how your campaign doing.
The Adset Level
Focusing on an adset level would give you a bit more specific data since you would zone in the targeting aspect of the campaign.
The Ad Level
Focusing on an ad level would give you the most specific data since you are zoning on individual ads. This would be best for ads that have spent a large budget.
By knowing which level you want to see will give even deeper insight on how your campaign is doing and how you can improve it.