Start11 currently locks off several features dealing with taskbar management if it detects the user is running a Windows Insider build.
Unfortunately, this is also applied to anyone stuck on a Release Preview build of Windows 11 22H2 with build numbers 22622.xxx or 22623.xxx, despite these builds being identical to the release builds 22621.xxx. These Insider builds were separate to test tabbed explorer or not, and after 22H2 came out both got bumped up a bit to bring them to parity with general release, but as the build number is one or two digits higher, there is no way to fully unenroll Insider yet.
See the linked Microsoft blog about what 22622 was for. 22623 was the update for 22621 and 22622 to get to parity.
As Windows 11 23H1 is cancelled and 23H2 is still months away, this means anyone like me stuck on an Insider build has no option but a full Windows reinstall to get back to release channel and use all features of Start11.
To be specific, my systems are running 22622.890 and 22623.891.
I suspect Start11 must be using some version number blacklist to cut off the taskbar features from what it sees as Insider builds. Hopefully, this can be turned off for the two builds I mention.