Why can I browse the network with discovery off?
You open up file explorer and you click on network and you can browse items but you have network discovery turned off. Why????
I'm sure the first thing you do is to check that network discovery and file and print sharing are indeed off for the current profile.
If that is the case then most likely the issue is the firewall. If the firewall is off or rules modified, then you will be able to browse the network even though network discovery and file / print sharing is off.