Little gems I have found so far.

brummyfan said:

You could give this a try:New File Explorer Missing In Windows 11? Here’s How To Get It

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Indeed, "Launch folder windows in a separate process" did it. I tried to undo that before, I just did not restart. Previously, it did not required a restart to revert to the Windows 10 explorer. I guess that's the feature of the preview - they have a working explorer (from Windows 10) to get back to if the new one encounters a problem.

Yeah, for what it is worth - as a general rule, don't rely on any information from the leak - too much has already changed.

Some things will inevitably be the same - but as time progresses and we get newer and newer Insider's builds, less and less of that will be applicable.

unifex said:

In my case, the File Explorer reverted to the Windows 10 one. I don't know what did I do to cause that. I actually read a number of posts where people where asking how to do just that. It appears I did it, but I don't know how and I would like it to go back.

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If you have Launch Explorer Window in a new process it will use the Windows 10 context.

Edwin said:

Search works well.
Indexing retains it's configuration.

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I still enjoy everything for search