Here’s how to enable it:
Open Zoom app on your desktop.
Head over to Preferences, Sound.
Check the “Mute my microphone when joining a meeting” box.
With these simple steps, the user can automatically mute the volume until it replays manually, which prevents any external sounds or any personal matters that could suddenly arise during a video call when speaking from anywhere.
If you want to turn off the camera by default, you can go to Preferences, Video, select a similar option.
This will ensure that you do not have to look perfect while joining a video call.