Where is the documentation for "Expert Configuration"?

If one clicks Tools > Options > LibreOffice > Advanced > Open Expert Configuration, the “Expert Configuration” dialog opens with hundreds, if not thousands, of option settings.

Where does one find the documentation explaining what any of those “Expert Configuration” options actually do if/when changed?

Simply reading the property name generally doesn’t give one any clue as to what that option actually does.

According to this answer in the mailing lists, you cannot find that documentation because it does not exists yet, sorry.

One can read the source code, but it takes quite an expert.