xr500 vpn service [router AS server] subnet woes *.*.2.* vs *.*.1.*

To use LAN resources away from home I have setup the VPN service which sets the xr500 as the vpn server. My mobile is a client using openvpn software. I am able to connect away from home. my devices are set on the subnet

192.168.2.0

What server or client app settings need I change to access

192.168.1.0

which is the default xr500 subnet.

As is when as a friends house 192.168.1.1 from my openvpn connected android loads his router credential prompt.  I have it set for LAN and internet access.  I can access the internet connected.

I have tried setting a static route but perhaps I have done that incorrectly.

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extra search terms: vpn subnet, xr500 vpn, xr500 vpn service, router as vpn server, openvpn configuration