Sometimes you will need to
activate a feature to use the web part on a site. In this article, I’ll show you how to activate a feature in Site Collection Features with just a few clicks.
Open SharePoint PowerShell and run it as administrator. Then run
-Identity FeatureName -url <URL>
-Identity “Bamboo.CalendarViewExtended”-url http://vschauo16
Now, refresh your site to see the feature activated as expected.