When you select the Engineering Data Sources button, as highlighted below, you display the available data sources that are included with the application.

The Engineering Data Sources pane allows you to select a data source to display in the Outline pane. This pane is used to manage the data sources that are available to you. It displays your libraries ( ) and favorites ( ). You can perform the following actions in this pane:

To perform these tasks, select one or more data source check boxes in the Edit Library ( ) column. Once checked, the table rows change color and the various fields are editable.