The vCenter Server tasks that you can perform when you connect directly to vCenter Server with the vSphere Client are limited.
The following vCenter Server features are unavailable or read-only in the vSphere Client:
Runtime settings
Licensing reports
Certificate management
Creating and managing categories and tags
Use the vSphere Web Client as the primary interface for managing the full range of vCenter Server functions available in your vSphere 6.0 environment.