TV link (full-screen wall, no buttons, follows whatever you change here):
Remote-control link (open on your phone to switch focus/audio on the TV):
Chromecast / Google TV / Android TV
sends the TV view to a Cast device. If that button can't find your TV, open the TV link in Chrome, then use ⋮ → Cast… → pick the TV (Sources: Cast tab).
Smart TV browser / Fire TV (Silk) / game console
Open the TV link in the TV's web browser. Use the remote: 1–9 focus a tile, 0 back to grid, OK turns sound on, ◀ ▶ cycle focus.
HDMI or Miracast (Win + K)
Extend to the TV, drag a window there, open the TV link, press F11.
Away from home
The links only work on your home Wi-Fi. For off-network viewing, cast or screen-share the PC window instead.