The Reference Sets dialog is a helper function of the Full Library Search dialog. Open it by clicking the Define Sets button in the Search In area of the Full Library Search dialog.
The Reference Sets dialog allows you to define custom collections of library material. This way it is possible to limit your "Full" Library Search to specific resources you are interested in.
Sample Reference Sets dialog, editing a custom reference set called "Reference Set 1"
To get started, click New to create am empty reference set. You will be prompted for a custom title. You can create as many custom reference sets as you need.
Use the check boxes on the right to add or remove resources from the selected reference set.
Click OK when you are done making your changes, and your custom reference set(s) will be included in the Search set of modules drop-down selector in the Full Library Search dialog.