Network View
I have an iMac (macOS Catalina) When I check Preview/NEtwork....I see someone else's iMAC. I'm in an Apartment who provides free-wifi. Should I be concerned? I have nothing checked in the sharing file.
iMac 27″, macOS 10.15
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if you connect to a free wifi then you should see all other devices connected on their wifi
if you enable firewall and don't set it to share stuff you should be fine