You have to go into an environment with loud noise where speech is present , if the noise is getting over the threshold (which is set by the fitter with the Target fitting-software) the autosense will invoke the program “Spheric Speech in Loud Noise” (this reduces the noise for better understanding speech).
You can see and check the current autosense-program if you perform the steps in the MyPhonak App which GaryH and the guy in the video described.
Another possibility: Have your fitter setup a dedicated programm for “Spheric Speech in loud Noise” , then you can switch to this program if you need it. But in this case you have to remember that your HAs are in the DNN Spheric Speech mode and you have to manualy switch back to autosense if you are no longer in the noisy environment. Because the battery drains faster in the Spheric Speech noise reduction mode and the battery would only last about 7 hours if you let your hearing aids constantly in that Spheric Speech in loud noise programm.