Setting the map scale
The map is in full-screen mode.
Press the Touch Control, the controller or the touchpad.
or
Select Map menu.
The map menu appears.
Select "Set map scale" in map menu 
More.
More. The map scale appears with the currently selected scale.
Vehicles for right-side traffic: the map always shows the currently selected map scale at the bottom left.
Vehicles for left-side traffic: the map always shows the currently selected map scale at the bottom right.
Swipe up or down on the Touch Control or the touchpad.
or
Move two fingers apart or together on the touchpad.
or
Slide the controller up or down.