Find My Mac is a macOS feature that enables you to locate your machine if it’s lost or missing. When you sign in to iCloud or the Find My iPhoneapp, you can see your missing MacBook on a map and play a sound to locate it if it’s close by.
Launch System Preferences from your Mac’s Dock, from the Applications folder, or from the Apple menu bar
Click System Preferences.
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Click iCloud in the preferences panel.
Scroll down in the Apps on this Mac using the iCloud pane until you locate Find My.
Locate Find My, and click Options on the same line.
Where it says Find My Mac: On, click Turn Off.
Enter your Apple ID password and click Continue.
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This is your Apple ID password, not your local Mac password.
Now enter your local Mac user password and click OK.
Click Done.
Find My is now disabled on your Mac.
To turn this feature back on, navigate to System Preferences > Apple ID, click the checkbox next to Find My Mac, click Options, and make sure it says Find My Mac: On.
Alternatively, you can disable Find My Mac by completely signing your computer out of iCloud. To do so, click Sign Out in the iCloud preference pane. If you sign out, any mail, contacts, calendars, photos, notes, reminders, or other stored documents in iCloud will be removed from your Mac, but they will remain in the cloud.