TIMER IN brings the bar on air and starts the countdown from the length above. TIMER OUT takes it off. Changing the length while it is on air restarts the count from the new value.
The L-Bar has a transparent background, so put it straight over your programme feed. The Ending is a full-screen card — it fills the frame on its own, nothing goes behind it.
Plain GET requests — paste them into a Stream Deck “Website” button. They do exactly what the buttons above do.