Steps to Expand and Collapse content items within Navigator Component
How can I configure an IBM® Web Content Management (WCM) Navigator component to expand and collapse the content item tree?
Edit the Navigator component.
Set the following fields: "Start Type" to Selected "Ancestor Level" to All "Descendent Level" to "1 Level" as shown in the diagram. ( This setting will display only the Site Areas beneath the selected Site Area ( Environment Program )