API Specification - Additional navigation level under Operation
The content under a given operation may be quite lengthy, one example is the "Update patient details" (PATCH /Patient operation) on the PDS FHIR API: https://digital.nhs.uk/developer/api-catalogue/personal-demographics-service-fhir#api-Default-update-patient-partial
Suggestion is to allow for navigation to sub-sections and have this accessible from the 'Page content' sidebar.