On Android you can change the notification sounds in the phone, it is not changed in the app.
On my phone I click through several layers to get to it, but you start with the notification when it happens.
Click on Setting Gear for WyzeMessage
Click on WyzeMessage
Click on Sound
Select the Notification Sound you want hear…
You can even add notifications sounds to the library from ones you created or downloaded if supplied tones don’t work for you
Android 14 on a Pixel 6 Pro, other phones may have slightly different method