One of two ways to view your extensions data within the extensions page.
Keep in mind that any time you create an extension, such as a callout or structured snippet extension, you can associate it to any of your ad groups or campaigns, or to your entire account. This means that a single extension can have multiple associations.
In the associations view, each row contains data that is specific to a single association of an extension, including the ad group, campaign or account to which it has been associated. If an extension has been associated to multiple ad groups or campaigns, it will be listed multiple times. Use the associations view to compare how a single extension is performing from one association to the next. You can also add or remove associations by ticking the boxes next to the associations that you want to change, and then using the Add to and Edit drop-down menus.
To see your extensions data without associations details, switch to the extensions view.