Disable IP MASQUERADE on OpenVPN interface

I notice that traffic from my LAN network to my OpenVPN connected network is being IP Masqueraded as the router. I don’t want this. Traffic through the router between the LAN and OpenVPN network on the other side of the tunnel should be properly routed without any Masquerading. All of the hosts on the OpenVPN network should be able to directly reach the hosts on my AR-750’s LAN and vice-versa without any need for Masquerading or NATting or DNATting.

Is it possible to disable this Masquerding through the OpenVPN interface?