Hi,
To achieve your requirements, you need to create two networks, deploy pfsense connector in the first network and define 10.18.0.0/22 subnet, then deploy the other pfsense connector on the second network and define 10.10.0.0/22. And on each network behind it's pfsense make sure to configure needed routing going to the other site network next-hop to the pfsense local/lan ip.
You may also refer to this link for more details >>
https://openvpn.net/cloud-docs/site-to-site-private-connectivity/
If you have doubts, please open a ticket at
https://openvpn.net/support/
Regards,
.\kionci