I am trying home assistant for the first time.
Downloaded haos from this page , it is not core Releases · home-assistant/operating-system (github.com)
Installed, it is running. Docker ps shows hassio_multicast, hassio_audio, hassio_dns, hassio_cli, homeassistant, hassio_observer, hassio_supervisor
But I do not see the supervisor menu option in web UI.
Assuming you chose a setup that actually includes supervisor: That’s because there hasn’t been a Supervisor menu for quite some time now. All the options that used to be under there have moved to other places, mostly to the Settings menu.