Once you've published an API reference (see Import an OpenAPI spec), manage it from the API reference list.
Edit & organize
Move a reference into a section, and control its draft/published status the same way you would a regular doc page.
Re-import
If your API's spec changes, re-import it to replace the reference's body with the new version — the reference's row shows which spec version is currently live, so you can tell at a glance whether it's up to date.
Reorder
Drag references (and their sections) to control the order they appear in your docs navigation.