Why is the mask of the famine Millennium fox worn sideways?

Famine Millennium fox mask can't be worn on the side.

The role of the Millennium fox mask: it can be used to find things. The effect shows that the green light means there is treasure, but it is far away. Blue light means equidistant from the treasure, and yellow light is basically in front of you If you deviate from the route, there will be no light.