The ringtone and notification sound volume can't be adjust separately as the Android operating system uses a single volume control for both.
If you've increased the ringtone volume and the notification sound seems too loud for you, consider muting the notification sound. 
To mute the notification sound:
- Go to 
				Settings.
			 
- Depending on your phone's Android version, do one of the following: 
- Select Silent, and then tap Apply.