The data that's visible in DoubleClick Search reports based on your current location within the DS hierarchy.
For example, if you navigate to an advertiser, you'll be scoped to an advertiser. If you click the Campaigns tab, you can see metrics for all of the advertiser's campaigns. The navigation bar tells you the scope of data that is currently being displayed. In the example below, the Campaigns tab is selected. The navigation bar indicates that data from all engine accounts for the Oceanic Airlines advertiser is being displayed on the tab.