The whole right section disappeared

Firstly you might want to remove that picture as it has your email address in it.

We do not offer official support for Insider releases of Windows because they are liable to introduce issues which may end up not impacting a future shipping product.  No sane company will offer support on those OSes, even Microsoft will not.

In this case the issue is that Microsoft developed a new taskbar for touch which they then pulled as they couldn't get it finished in time for the next release version.  Unfortunately Start11 was aware of the new taskbar and the new update rolling it back to the release one means Start11 isn't handling it correctly.  Ironically we would have been better off ignoring insider releases entirely!

We do however have an update due for release this week which makes it aware the old taskbar is back on those builds and it will resolve this issue.  You can also read this thread for a registry key change which will help https://forums.stardock.com/512230/running-win11-insider-22616

I would ask that you consider if you really need to be on insider builds of Windows 11.  The dev channel in particular shouldn't be used by anyone who wants to actually needs to use their computer and the beta channel shouldn't be used by those who need to use their computer on a daily basis unless they absolutely require to test things on the latest.  Things will break and the dev channel in particular is expected to have more issues of its own once it splits off from the beta channel again (they are currently the same)

First of all, I did not ask for your support to make Start11 work on this evaluation version. I wanted you to know that they are changing something and you need to get ready for that. Seems like you already know about it.

Thank you very much for your response.