You can filter the locations of the farm in the following ways:
– enter a text in the search box above the locations
this will search as you type for this string in the title, ID and URL of a location
– Select a location scope: If you select a scope, e.g. Farm or Web Application, only locations with that scope will be shown in the result window
– Select a location by clicking on it. In the menu below, click on the filter. This will show this location and all its children in the location list (e.g. the selected site collection and all webs of this site collection.
– Select a feature definition (left window) and in the menu of feature definitions below select the filter with arrow to the right: This will filter all locations in the right location window, where the selected feature definition is activated.