To silence incoming call and notification ringtones, place your hand on the screen or flip the device over.
Follow these steps to disable call ringtones on Samsung Galaxy J7 Plus:
Step 1: Access 'Settings' and choose 'Advanced features'.

Navigate to 'Settings' and choose 'Advanced Features'.
Step 2: Select 'Disable Easy Sound'.

Choose 'Disable Easy Sound'.
Step 3: Turn on the feature.

Activate the feature.
That completes your setup process. Wishing you all success.
