Template:Collapsible sections option

How to manage this template's collapsible groups/sections option

This template uses Navbox with collapsible groups. When it first appears, one of its groups/sections may be set to be visible ("expanded") while the others remain hidden apart from their titlebars ("collapsed"). To achieve this, include the parameter   where group/section is one of the following names identifying the groups/sections (omit any speech or quote marks):