What does ifscore.networkpolicy.enabled really do?

The easiest way to confirm a Helm setting is to verify the Helm chart definitions.
From the Windows Management PC (the below assumes that the JFrog IFSCloud repository has already been added from a previous installation):

mkdir tmp
cd tmp
helm repo list
helm repo update
helm search repo ifs
helm pull ifscloud/ifs-cloud --untar

In tmp\ifs-cloud\charts\ifscore\templates\network.yaml, there is a Helm if block for when "networkpolicy.enabled" is set.
There are multiple Kubernetes NetworkPolicy resources, each applied to specific matching resources.
They allow / disallow specific traffic: ingress, egress, ports, TCP/UDP, IP range etc.
See Kubernetes documentation for NetworkPolicy for complete details:https://kubernetes.io/docs/concepts/services-networking/network-policies/

You can then list all of the NetworkPolicy resources in your cluster:

kubectl get networkpolicy -A

You can select one of them to view the actual definition and confirm the details in the above NetworkPolicy documentation.

kubectl get networkpolicy/<networkpolicy resource> -n <namespace> -o yaml

You can remove the tmp folder to cleanup if you wish.

Best regards, Ben