Can I have an ARP table from a Switch not part of OPNSENSE?

[fbeye]

Hi so my OPNSense LAN is 172.16.2.1 and the Switch connected to it (that has the subnets) with a LAN 172.16.2.2. I have, on OPNSense, 6 static routes to find 6 networks on 172.168.2.2. On the Switch I have 0.0.0.0 172.16.2.1 default route back for all networks to reach Internet.
All works fine. On the Switch, Cisco SG350XG my arp table has all 20-30 lan ips as it should. On OPNSense the ARP table just shows 172.16.2.1 and 172.16.2.2. I was curious if both the switch and OPNSense clearly communicate via the 172.16.2.0 Network, should the OPNSense also be able to see the arp table as well?

[Patrick M. Hausen]

ARP is only for directly connected networks. Anything that is reached via another router is not visible in ARP.

[fbeye]

Outside of 'ARP' is there any higher level type software or application that can see the network as a whole? I only pursue because the networks can all ping each other so there is a 'link' but again, may not be something that is done under normal circumstances.