How do I turn off find my iPhone on MacBook?

Don'ts

If you remove the device from your account after you erase it, Activation Lock will be turned off. This allows another person to turn on and use your device.

Find My iPhone from MacBook cannot be turned off. You can turn off Find My Mac. Watch the GIF below.

Look here --> If your Mac is lost or stolen - Apple Support

If Find My Mac is turned on,

use it to locate your Mac

If you didn’t turn on Find My Mac,

change your password and report

your Mac as missing

If you removed it from the device list in Find My ( https://icloud.com/find ) then it's off.