I think it's on page 232 of the owner's manual.
The Display Unit Speedometer / Odometer: function allows you to choose whether
certain displays appear in kilometers or miles in
the multifunction display.
X Press the left or right arrow button on the steering
wheel to select the Sett. menu.
X Press the up or down arrow button to select the
Instrument Cluster submenu.
X Press ok to confirm.
X Press up or down arrow button to select the
Display Unit Speedometer / Odometer
function.
You will see the selected setting: km or miles.
X Press the ok button to save the setting