The Home menu has four options: Voyager Search, Saved Searches, [Lists |DOC:Working with Lists]and Processing. Voyager Search clears any previous search, brings the interface to the main page and shows all indexed data. Saved Searches takes you to a list of previously saved searches. Lists displays the various lists you have created. Processing displays a history of the process tasks that have been run.

Shortcut
The Voyager GIS Data Discovery logo at the top of each page also clears your search and brings you back to the main page.