A suggestion for an easier user operation and experience -
Currently, selecting the sound options - All, Alerts Only or None, requirs 3 clicks -
* Click the sound icon on the main display to open a pop-up window.
* Select one of the 3 sound options.
* Approve the change.

Instead, the sound icon on the main display could be implemented and function as a toggle button, changing between the 3 sound options upon each click on it, and reflecting its status by a different icon display - All, Alerts Only or None

This will save the user 2 more unneeded clicks and prevent the need to use additional pop-up window, while hiding the main screen in the back.