Your picture from your classic app shows Living Room Smoke…
There is shown a smoke detector in the icon, looks correct.
Next step is to start a fire / smoke to test the detector. Some paper tissues in a metal dustbin gives a smoke you hardly see, but should trigger the smoke detector.
In the Classic app, there is a Dashboard with the Home page. On the bottom is Home Solutions with Smart Home Monitor (SHM).
Press on * Everything OK >
Now you see Status from Smoke and Leaks detector(s).
At least Smoke should show OK with green dot.