Introducing Microsoft Teams support for Microsoft 365 Targeted Release commercial cloud customers

brownt63130 Thanks for your question. As mentioned in the blog post, Targeted release take precedence over Public Preview program. Since you're a part of both the programs, you are seeing the experience for Targeted release user as expected. Users in Targeted release are configured to always get early access to new product and features. Option to opt in/out is not available for Targeted release users. 

For the difference between Public preview and Developer preview -

Public Preview is to get early access to unreleased features only for Teams. You can explore and test new features before it rolls out to rest of your organization. Developer Preview is early access program for app developers.

PS. There is a known issue for Targeted release user that Developer preview is visible under About. This will be fixed soon. 

Here are some resources on Public Preview and Developer preview for more information:

Public developer preview for Microsoft Teams - Teams | Microsoft Learn

Public preview in Microsoft Teams - Microsoft Teams | Microsoft Learn

Hope this helps. Please let me know if you any other questions. Thank you!