Apple is changing how its Find My Mac tool works in macOS Catalina and iOS – it will now use Bluetooth and should find your Mac even when it is asleep.
How does ‘Find My’ Mac work?
Apple is combining two apps – Find My Friends and Find My iPhone into a new ‘Find My’ app.
The combined app offers what we are used to from each one of these individual apps, but introduces new tools based on Bluetooth.
The ideas is that it will use low energy Bluetooth signals to help bring people together with lost things.
Refer Here for Original Post and Source https://www.computerworld.com/article/3404498/how-find-my-mac-works-in-macos-catalina-and-ios-13.html#tk.rss_all