Why does my MacBook Pro 16" M1 plays a sound alert when switching apps and how can I turn it off?

Hi Snswp001,

It sounds like you're looking to adjust system sound settings. If so, for help with adjusting your macOS sound settings, check out the section "Choose whether to hear user interface sound effects" below and from the guide page here: Change the alert sounds on Mac - Apple Support

"Change the alert sounds on Mac

1. On your Mac, choose Apple menu  > System Settings, then click Sound  in the sidebar. (You may need to scroll down.) 
2. Click the pop-up menu next to “Alert sound” on the right, then choose a sound.
3. The alert plays when you select it so you can hear how it sounds.
4. Do any of the following to adjust the alert sound.

• Change where you hear alerts: Normally you play sound effects through your computer’s internal speakers, but if another sound output device is available, you can choose it from the pop-up menu next to “Play sound effects through.”
• Adjust the volume of alerts: Drag the Alert volume slider. The alert volume is relative to your computer’s output volume, so if you lower the computer’s volume, alert sounds also play more quietly.
• Choose to play a sound when your Mac starts up: To hear the startup chime when you restart your Mac, turn on “Play sound on startup.”
• Choose whether to hear user interface sound effects: Your Mac plays sound effects when you perform certain actions, such as dragging an item to the Trash. To turn off these sound effects, turn off “Play user interface sound effects.”
• Choose whether to hear a sound effect when you change the volume: On some keyboards, when you press one of the volume keys, a sound plays to let you hear the new volume. To prevent this sound, turn off “Play feedback when volume is changed.” To temporarily reverse this setting, hold down the Shift key as you press a volume key. (Not all keyboards have volume keys.)"

You can also find helpful information here: Change Sound settings on Mac - Apple Support

If there's a different issue present or you have a different question, let us know. We'll be happy to continue to assist.

Cheers.