Can I change the theme of the map?

Yes. You can use a custom style for Maps and can set the color schemes. 

To change the theme of the map: 

1. Tap the Settings tile from your Dashboard.

2. Under Map Preference, toggle the Set Map Theme Automatically switch to OFF (i.e. disable this functionality).

3. Tap the Choose Map Theme button.

4. Select a theme from the list

If you enable the Set Map Theme Automatically option, the app will automatically adjust the theme based on the time of the day.