Live view of what every screen is showing. Refreshes every 15 seconds.
Thumbnails are live screenshots taken over ADB from an office machine, so they show what is actually on the glass. Click one to enlarge it. A screen checks in every 30 seconds. "Late" means it has missed a couple of checks; "offline" means it has not been heard from in 10 minutes, so the browser is probably closed or the machine is asleep. "Screen black" means the screenshot itself came back completely black: the TV's panel is off or asleep, even if its browser is still checking in.
These are served by the mirror, and every screen showing one arrives from the same office address, so they cannot be told apart per TV. What is shown here is whether each dashboard is still being captured and how fresh it is.