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
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