While creating Container Service Extension in VMware Cloud director you may notice that the CSE Management option does not appear under Kubernetes container cluster.
VMware Cloud Director 10.6.X
This issue occurs when there is still older version of Kubernetes Container Clusters plugin is still active in VMware Cloud Director.
Note: The CSE Management tab should only be visible in the Provider portal of Cloud Director, and shouldn't appear in the Tenant portal of Organizations.
For more information please refer, VMware Cloud Director Container Service Extension Server Prerequisites