Hi carmine, here's a quick demonstration image:




Notice there that it's actually not just a simple solid view, the edges that are hidden are displayed in a faint dashed line style, and you can also select them same as the front edges.

You can disable the hidden line display under Options > View if you want, but by default they are on and you should see them in your display.

They won't be very apparent in just a single sphere like you showed in your screenshot though since that has only one edge in it. If you make a model that is made up of more pieces and has more faces and edges in it then you will see them more easily.

- Michael