Place <Expandable> inside a field. Usage# <ResponseField name="user" type="object"> A user record. <Expandable title="properties" defaultOpen> <ResponseField name="id" type="string" required /> <ResponseField name="name" type="string" /> </Expandable></ResponseField> The default title is properties. Example# userobject#A user record.Show propertiesHide propertiesidstringrequired#namestring#