How to mute beep sound from logout icon?

I’m new to Manjaro, and 1 years of Debian based distros. So, everything is somehow a little problem to me. I want to turn off beep sound which emerge whenever I click logout icon or some error occurr. Setting system volume to 0 doesn’t work for this. My DE is xFce. No problem with KDE Plasma used 1 week ago. Just switched xFce due to its simplicity.
Here is YouTube link!

Hello,

I think you are referring to the PC speakers beep. Try this from terminal:

echo "blacklist pcspkr" | sudo tee /etc/modprobe.d/nobeep.conf

After a reboot, it should be gone when you log out again.

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