Open WhatsApp
Go to Settings
Tap Notifications
Turn off Call notifications
On Android, tap Ringtone and set it to None if available
On iPhone, mute WhatsApp notifications in iPhone Settings
Open the chat or contact you want to mute
Tap the contact or group name
Turn on Mute notifications
Choose the mute duration
If needed, enable Do Not Disturb on your phone to silence all calls from WhatsApp