Nexus 3 and Postgres

A member of your team had ran into a note stating that we needed to upgrade our Nexus3:3.68.1 from H2 to Postgres. After performing the upgrade we found that the instance was still using H2 and we were getting errors so we rolled back. Looking into Nexus Admin screen we saw h2 was hardcoded and we could not find a way to change that. I later saw other notes that stated that after version 3.77, this was supported not just in the Pro version.

I am just looking for clarification on what database we should be running with Nexus 3 v3.77.1 going forward.