The quick settings can only be accessed in the dashboard mode. Tap on the little arrow-button on the bottom left to view the settings. This button disappears as soon as you start riding. Hint: One tap bring on the screen brings it back temporarily at any time. Here, you can manually switch through the light modes by tapping on the light icon multiple times and activate the automatic light, turn the voice feedback on or off and activate or deactivate the charging of your phone.
If you are from the US, by law you cannot interact with the app by touching the screen while riding. So in order to access the quick settings you will have to come to a stand still.