How is the groove carved into the bottom of the slicer used?

When you turn over SHIMOMURA's Vegetarian Slicer, you will notice a concave groove carved into the edge of the bottom.

It is used by hooking it on. Instead of propping it up diagonally on a cutting board, fitting the groove onto the rim of a mixing bowl or dish firmly fixes the mandoline slicer in place so it does not slip back and forth^[2]. The sliced vegetables gather directly inside the bowl without scattering outside, making the cooking process simpler.

After setting an appropriate thickness in the range of approximately 0.5 to 2mm using the thickness adjustment lever, simply push the ingredients lightly^[3]. When the ingredient becomes small and your fingertips get close to the blade, you can hold the vegetable by covering it with the included dedicated holder to prepare it all the way to the end without injuring your hand^[4].

hmmm, with just one small groove on the bottom, it is a clever design that helps you finish preparing ingredients all at once over a bowl without using a cutting board.