Trusted Zones

Hi,

I just installed COMODO. Now, I have a question.

How can I block a certain Zones? I have 2 trusted zones. 1. Home network 10.0.88.0 and 2. Office network 172.21.0.0. I want to block all zones expect the two I mention. is that possible? I tried to connect to test zone 192.168.0.0 but I can access the internet and can browse the network.

Please help!

Thanks.