You can set any place as your starting point. Tap or swipe up the bottom sheet, then choose Set as starting point in the details.
The route planner appears. Type the destination in the Search for destination field or choose Select from map. Tap the desired location, then + Set as destination, or if the location details are expanded, tap the + button.
The route planner now shows the starting point and destination. You can launch navigation using the Arrow icon at the bottom or customize the route by tapping Edit next to the route planner panel.