Using OIKWAN usb-c to ethernet cable on catalina
You’re not going to find it in Networking, because it’s a Cisco console cable and USB to RS-232 UART all-in-one.   The Cisco console cable is a serial cable, with a DB-9 on one end and an RJ-45 connector on the other - it’s not Ethernet.
You will need an application like screen (comes with macOS), Minicom or iTterm2  that allows you to connect to the serial console.  Most importantly, when you plug it into the router, you cannot plug it into any of the network ports - you need to plug it into the console port.