The TLS home page shows you the count of computers with a particular protocol (enabled or disabled) on both the client-side and the server-side. You can see the protocol details (including the count of computers) in the tooltip when you hover over the bar chart columns.
From the TLS home page, you can drillthrough to the List of Computers by TLS Protocol and Setting page for additional details.
Once a filter is selected, for example, the Collection Name, it remains in place until replaced by another filter. Filters are generally enabled when you drillthrough from one page to another page. In the footer of all pages, you’ll see, Date Last Refreshed. This information tells you when the TLS data was last queried and imported from SCCM into Power BI.