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 Template:Plaincode where group/section is one of the following names identifying the groups/sections (omit any speech or quote marks):
• Template:Plaincode
• [[[:Template:Thinsp]]]Template:Thinsp For example: Template:Plaincode

• [[[:Template:Thinsp]]]Template:Thinsp The group/section named Template:Plaincode has been set to be visible when the template appears.