Here's a start to the Montana Menu Page decode.
The following screenshot is what the subsequent code is referenced to:
The layout is 3x3 columns. The App position starts in the UpperLeft and flows down then move right and flows down, etc.
The interesting thing (to me anyway) is that the Drawer (if you still have one) is considered the "Main Menu"
Well, that should get you all started. Got to run...
Cheers,