Edgerouter X firewall configuration to prevent communication between ports.

Hello all,

I am new to networking and have decided to buy the Edgerouter X as a router. I have 3 diffrent switches connected to eth1, eth2 and eth3. I want to configure the router to prevent devices on each eth port to communicate with one another. But I still want all these switches to be able to access the internet.

What firewall rules and settings would I need to change to achieve this? Any help would be appreciated!