First, change your Network Profile to Private:
https://www.groovypost.com/howto/change-network...
Do this for any other computer you have on the network.
Open Start > Settings > Network & Internet > Status
Scroll to the bottom
Click Network and Sharing Center
Click Change advanced sharing settings
Expand All Networks
Under Password protected sharing
Switch between 'Turn on password protected sharing and Turn off password protected sharing'
Then choose 'Turn off password protected sharing'
Then click 'Save changes'
Also see instructions to make sure each computer can access each other: