Select for example 'Search another place' and select an area where are routes.
When results are loaded click the 'Filter Results' button.
Note that the label right of the length slider says 'miles' even though the slider value actually is in km.
Note that when you hover the mouse over one of the route icons on the map the popup says the name of the route + the length of the route. The length value is in km (correct) but the unit label after the value is 'miles'. For example 'My cool route (35.6 miles).