How to remove a PC from shared section in the finder

Community,
I found a pc name in the "shared" ("CONDIVISI" section for italian speakers like me!!) section of the left menu in the Finder. It is something I don't recognize. I never connected to this computer. Any clue how it has been able to get there? How to remove it?
I appreciate your answer
Antonio

Most likely, at some time, "betesda-vaio" was connected to the same network as your Mac.  (Perhaps a friend connected their Vaio laptop to your wireless network during a visit?)
The Shared (CONDIVISI) section shows devices that are available on the network; it does not mean that your Mac is connected to the device (in this case "betesda-vaio").
If "betesda-vaio" is no longer on the same network as your Mac, if you log out (or restart), it should disappear from the sidebar.

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