How do I stop the BEEP every time I save an invoice?

in windows bring up the control panel and click on sounds, find the sounds tab on that window and scroll down looking for quickbooks, then you can set the  sounds as you link including none

I do not know if this work for QBO, probably not since it is not installed

In Desktop, go to Edit menu > Preferences. General, on the Left. My Preferences (this computer installation settings) on the Right. Remove the Checkmark from:

Beep when recording a transaction.