Could you specify what exactly you want to list ? If it comes to listing network policies in all your namespaces, you can use the following command:

kubectl get networkpolicies  --all-namespaces

If you want to list all your kube-proxy related resources, you can do it by running:

kubectl get all --all-namespaces | grep kube-proxy

As you can see there are only Pods and they are located in kube-system namespace, so kubectl get pods --namespace kube-system will also list them.

If you want to see their details, run:

kubectl describe pod <kube-proxy-pod-name> -n kube-system

Please let me know if this is what you're looking for.