The Quality of Service page is identified in the top left corner. On the far right corner is an Auto Refresh Data slider that lets you freeze the data stream or allow it to continuously refresh.
On the far right of the navigation bar is a toggle that lets you choose between seeing data for Video and Phone in the Overview report.
In the top navigation bar are the tabs available under Quality of Service. Choose any of the other tabs when you want to exit the Overview and review data offered on these other pages.