To silence incoming calls and notifications, simply cover the screen with your hand to mute the sound.
Turning off Smart Sound on Vivo V7 following these steps:
Step 1: Navigate to 'Settings' and select 'Smart Motion Control.'

Select 'Smart Motion Control'.
Step 2: Choose 'Intelligent Calling'.

Choose 'Intelligent Calling'.
Step 3: Enable 'Mute Smart Sound'.

Activate the 'Smart Mute' feature.
Congratulations! Your setup process is now complete. Wishing you all the best.
