I have installed this volume control app on my Android 6.0 phone in order to tune notification volume independently from ringtone volume. However, when I tried to do that, I got the following dialog:
Could someone tell me where the above-mentioned setting is located? I have searched through the Sound&Notifications section, but didn't find anything.
Could it mean that the app doesn't support Android 6, or that it doesn't work without rooting?