K8s kubernetes-dashboard V2 rbac how to allow only one namespace with full permission?

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K8s kubernetes-dashboard V2 rbac how to allow only one namespace with full permission?

Cluster information:

Kubernetes version: 1.19.2
Cloud being used: bare-metal
Installation method: kubeadm
Host OS: ubuntu 20
CNI and version:
CRI and version:

Hi! I have K8s cluster I use kubernetes-dashboard V2 as superadmin, work well. I need allow access to one namespace with full access in this namespace for sub admin. I try to made rbac rule to allow it, but work only in shell. From dashboard web UI is not work. How to make it?