Turn on Siri
If you try to use Siri when it’s turned off, you may be prompted to enable Siri. You can also turn on Siri in System Settings.
Note: You must be connected to the internet to use Siri.
Go to the System Settings app
on your Mac. Click Apple Intelligence & Siri
(or Siri 
) in the sidebar. (You may need to scroll down.)Turn on Siri, then click Enable.
After you turn Siri on, you can further customize Siri settings. For example, you can enable “Hey Siri” or “Siri” to activate Siri with your voice and choose how Siri sounds.