I'm not aware of an updated menu structure map, nor of a consolidated description of features of the current 1.2.40 firmware.
Unfortunately, it takes a bunch of time and effort to create such documentation, so I'm not sure if anyone has donated such an effort.
You can look at the release notes for each of the versions to get the info (but that's a lot of release notes).
And there are lots of youtube videos that touch on one or more of the features. And lots of past messages in this forum, which you can search for a particular menu item you may be interested in.
Maybe someone else here is aware of good places to look...
Stan
