You're both right I think. When you navigate with a particular mode you're choosing a profile, which, as well as routing preferences has a map style and most of the other osmand configurations specific to it.
You can configure the map for the car profile by swapping the map to it (by navigating, by clicking on the world/foot/bus/bike/etc icon or in the list at the top of the menu) and then go menu, configure map, map style (a long way down). Also look at the option 'More details' in Details (not sure if this is needed for what you want).
I would say I can find Osmand struggles to render at driving speed, particularly with details turned on, so it might not work so well for you. Alternatively, find the point you want to stop in another profile and add it to the navigation.
Hope that helps
Tom