pfSense » pfSense Docs

URL: https://docs.netgate.com/pfsense/en/latest/vpn/openvpn/configure-overrides.html

sub heading: IPv4/IPv6 Local Network/s

Note: This is functionally identical to the same fields on the OpenVPN server configuration. There is no need to duplicate those values here. Only exceptions or differences from the default entries should be in these fields.

I think it would be good to clarify in the note that adding networks to the override does not "override" the server setting but is additive. The server defined local networks are also pushed to the client.