Apple Intelligence is an AI feature available on Mac, iPhone, and iPad with modern versions of system software.
To turn off Apple Intelligence on Mac, go to System Preferences, navigate to 'Apple Intelligence & Siri' and toggle the switch to the OFF position.
To disable Apple Intelligence on iPhone and iPad, open the 'Settings' app, go to 'Apple Intelligence & Siri,' and toggle off the 'Apple Intelligence' setting.
Disabling Apple Intelligence recovers approximately 7GB of storage space on the device.