To configure your notification settings, open WhatsApp for web or desktop > Menu > Settings > Notifications. Here you can:
You can also mute individual chats. Click on a chat > Menu > Mute > and select the preferred amount of time. To turn notifications back on, find the muted chat and click Menu > Cancel mute.
Note: If you mute a group or an individual chat on your phone, it will also be muted on WhatsApp Web/Desktop. All other notification settings are independent of your phone and computer and do not affect one another.
If you are not receiving notifications on WhatsApp for web, please follow the specific troubleshooting steps for your browser: Chrome | Opera | Firefox | Safari | Edge