How to turn off the Find My sound?

I can’t really say for certain (since I’ve never had to use Find My on my MacBook) but there should be a popup saying Find My [Device] Alert and dismissing that should make it go away and the noise should stop. On your phone there is also a Stop Playing Sound button you can also try.

How often do you use Find My? We have 5 Macs and have never used it ... no alarms; no lost Macs.

Can't turn off the Find my device sound