The function is great when you want to see the route standing still.

For automatic zooming, it would be great if it was more dynamic. No setting, but zoom out more while driving straight ahead so you can see a big part of the route and zoom in when an exit is coming, keep the exit arrow just in the screen while zooming in from the point you are driving. Keep zooming in until you are near the exit and have a detailed view of the crossing. Once past the crossing zoom out until you see the next exit again just in the screen or the greater part of the route.

This way you get details in time, and see the most part of the route while just driving straight ahead.