The Account-wide Campaigns summary that displays on the Campaigns screen provides a quick overview of all the campaigns in your account. It can be viewed in Classic table or Screenshot layout, or in our highly customizable Pro View.
Campaign Keyword Limit
There is a maximum limit of 500 keywords per campaign in order to ensure efficient report generation and convenient viewing of the Classic view screen. Adding more than 1000 keywords to a campaign will cause some additional functionality to be disabled in other views.