I also wish that they would either switch the split screen on and off depending on what you selected or at least give us the option to be able to show what we prefer via an option screen. But as far as I know, that's not currently possible
On the other hand, if you don't like the split screen view, simply press the voice command button and tell the system 'split screen off' and it will switch back to the full screen display. That's what I do most of the time when I want to get back to full screen navigation map view!