Answer for:

How can I block LAN IP?

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If you know the specific IP address, and can add rules to your firewall, then the best option is to add a rule "Deny [IP Address] Outbound ANY" as the first rule ( or however you firewall displays the rules).
This will block the user from all internet access.
I would also recommend that you log back in to the firewall after a couple of days and make sure the rule is still there, just in case the problem user turns out to be someone that ALSO has access to the firewall.