I am looking for this also. They think that passengers cant do anything While the driver pays attention to the road. If someone Has details on this (dummy proof for us programmingly challenged) that would be awesome!
It would be in the 5F module, in Adaptations, and the name is "Locked menu contents". Open up that adaptation and for every entry that says "Blocked", change it to "Non-blocked". There are probably 30-40+ 'blocked' entries so it'll take a little while. And when you're done you hold down the green checkmark to apply the settings.
You can get the Carista app and 1 weeks usage for $9.99. You'll need an OBD2 dongle which you can get from Amazon for $15. Then you just go through the customizations in the Carista app to make changes. Find the one you want and enable or disable it or turn it on or off with 1 click. For your specific question you just go to Instruments- Display and Nav and select Allow Car settings in MMI while in motion and select Yes.