In PFSense, you can configure a network interface as a bridge, or network switch, by creating a bridge interface and adding the desired network interfaces to it. A bridge interface allows you to connect multiple network interfaces together and treat them as a single interface.
Here are the steps to configure a network interface as a bridge in PFSense:
In the PFSense web interface, go to Interfaces > (assign).
Click the "Add" button to add a new interface.
In the "Interface" dropdown, select "Bridge".
In the "Bridge Configuration" section, select the network interfaces that you want to add to the bridge.
Click the "Save" button to save the changes.
After creating the bridge interface, you can configure it like any other network interface in PFSense. For example, you can assign it an IP address, enable DHCP, or configure firewall rules.