Installation of Plugins - Not able to view/use installed plugins on Grafana Application

I’ve installed some plugins through windows command prompt using grafana-cli successfully. The problem is I’m not able to view/use installed plugins on grafana. I’ve used the following commands to install a plugin for your reference:

C:\WINDOWS\system32>cd C:\Program Files\GrafanaLabs\grafana\bin

C:\Program Files\GrafanaLabs\grafana\bin>grafana-cli.exe plugins install jdbranham-diagram-panel

After suucessfully installed:

C:\Program Files\GrafanaLabs\grafana\bin>grafana-server restart

Grafana Version: 6.7.1 (Open Source)

Please help.