By default, the volume buttons on the Samsung device are used to control the ringtone volume. Samsung's One UI user interface allows its users to use the media volume buttons by default, so if this feature is enabled, the media volume is changed outside apps (for example, on the home screen).

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds and vibration
Step 3:  Tap on  Volume
Step 4:  Enable or disable  Use Volume keys for media
  1. Open the Settings
  2. Tap on Sounds and vibration
  3. Tap on Volume
  4. Enable or disable Use Volume keys for media

Samsung Instructions
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