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It’s possible to separate your client by adding a traffic rule.
With Traffic rules, you can filter traffic moving through the device based on IP address, Network segment, Mac address, Zones, Protocol, Port.
Enter in your router’s WebUI, go to Network > Firewall > Traffic Rules and scroll down to the bottom of page, there’s a section for ADD NEW INSTANCE, select Add new forward rule, source zone = lan and destination zone = lan.
The example below would not permit the devices in the network 192.168.20.0/24 to communicate with devices in the network 192.168.30.0/24
If you want to block the communication from the other sense, you have to add new rule, just changing the network segment.
Should you need any additional information please let us know.