You can set Android Auto on your phone on the Settings > Advanced features > Android Auto settings page:
To use HERE WeGo with Android Auto you have to turn on Android Auto on the HERE WeGo Settings page.
When you start using HERE WeGo, you could limit apps in Android Auto launcher to a minimum. If HERE WeGo works stable and reliable, then you can also put your favorite applications there.
If you wouldn't like to use the Map application, then you can turn it off under Settings > Applications > Map. Then, for example, the contents of the launcher could be: HERE WeGo, Phone, Settings, Exit.
Day/Night mode for maps : Automatic . This setting applies to the display on the head unit and is independent of the display mode set on the phone.
Start Android Auto automatically : Always
Start Android Auto while locked : Access to your phone features will be available on the car screen while locked: On
Wireless Android Auto : set depending on the type of connection.
Other settings can initially be left at their defaults or turned off.