Bluetooth
Bluetooth icon missing from system preferrences
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Bluetooth icon missing from system preferrences
Would help to know what type of Mac you have, some BT settings are stored in NVRAM which can be reset on Intel Macs (reboot with command-option-P-R keys pressed) and is tested on M1/M2 Macs when cold booting (not a restart, but rather shut down, wait a few seconds, then start up).
Boot in Safe Mode and see if it's there:
How to use safe mode on your Mac - Apple Support
If that doesn't work, you may need to reinstall MacOS.
How to reinstall macOS - Apple Support
Would help to know what type of Mac you have, some BT settings are stored in NVRAM which can be reset on Intel Macs (reboot with command-option-P-R keys pressed) and is tested on M1/M2 Macs when cold booting (not a restart, but rather shut down, wait a few seconds, then start up).
Boot in Safe Mode and see if it's there:
How to use safe mode on your Mac - Apple Support
If that doesn't work, you may need to reinstall MacOS.
How to reinstall macOS - Apple Support
Have you restarted? Sometimes a simple restart will put things right.
Bluetooth