How to manage your Insider ring, for xbox one, or leave the program.
23NOT ALL INSIDER RINGS, ARE AVAILABLE TO EVERYONE. Some are rings are now closed off. You might only be able to see beta, or ring 3 and ring 4. You cannot go from Beta to Alpha, or from Ring 3 unless are able to see the option.
My understanding is, the Alpha, beta, and Ring 3 and 4, that were based on your original level when the program started from the Preview to Insiders program.
Xbox One Update Preview Alpha – The first Preview ring, this group typically receives 2-3 new system updates per week during a Preview Update wave. Preview Alpha is the cutting edge, and users in this group receive access to new features and fixes as soon as possible at the expense of potential bugs.
Xbox One Update Preview Beta – The second Preview ring, this group typically receives 1-2 new system updates per week during a Preview Update wave. Preview Beta users receive frequent system updates and early access to new features and fixes, with somewhat less risk of encountering bugs.
Xbox One Update Preview Ring 3 – The third Preview ring, this group typically receives 2-3 new system updates per month during a Preview Update wave. Preview Ring 3 users receive infrequent system updates, and is suited for users who want early access to new features and fixes with less risk of encountering bugs.
Xbox One Update Preview Ring 4 – The fourth and final Preview ring, this group typically receives new system updates about once per month. Preview Ring 4 users receive system updates which are almost ready for public release, and thus receive the fewest system updates and are least likely to encounter bugs. In some cases, Preview Ring 4 users may also receive updated versions of the current publicly released build incorporating new fixes.
Wording taken from
https://www.onmsft.com/news/xbox-insider-program-to-get-its-own-series-of-rings