Besides keyword searching, the indexed items can be browsed by facets, which represent specific item properties.
Every facet organizes the items into groups (possibly hierarchical) depending on a specific item property.
Selecting a facet in the Facet panel will give you a list of all values of the selected facet in the lower part of the panel. (In the example, the source facet has a list of keyword suggestions as values.) To search for items that match with a facet value, select the facet value and click the Search button or double-click the facet value.