Sometimes you just want to silent everything; from ringtone to receiver voice. You can either turn down each volume or turn off all sound on Galaxy Note 8 by one tap. To do the first way, you need to go to your Sound settings, but the second way in done by doing as follows:
1. Open "Settings" App
2. Go to "Accessibility"
3. Mark "Turn off all sounds" from Hearing settings. It turns off all sounds including receiver voice