Turn Bluetooth on or off on Mac
Turn off Bluetooth when you’re in places where radio communication may be prohibited, such as on an aeroplane or in a hospital.
Ask Siri. Say something like: “Turn Bluetooth off.” Learn more about Siri.
On your Mac, click the Bluetooth status icon
in the menu bar. Choose Turn Bluetooth On or Turn Bluetooth Off.
Note: If Bluetooth is turned off, features such as Continuity, Instant Hotspot and Handoff may not work between your Mac and other devices.
If the Bluetooth status menu isn’t visible, choose Apple menu 
> System Preferences, click Bluetooth, then select “Show Bluetooth in menu bar”.
You can also turn Bluetooth on or off in Bluetooth preferences. If you’re using an external USB Bluetooth adapter, Turn Bluetooth On or Turn Bluetooth Off may not appear in Bluetooth preferences. If it doesn’t, unplug the adapter to turn off Bluetooth.