Re: "Turn off AI reply suggestions in iMessage
Is there a way to turn off Apple Intelligence reply suggestions in iMessage on Mac?"
I don't see that mentioned specifically, yet there are ways to turn off AI features:
From the Mac User Guide:
See: Turn off and restrict access to Apple Intelligence features on Mac - Apple Support
Eg: says:
"Change how you see suggestions from your apps
See Customize apps Siri has access to."
Also says:
"Suggestions are on by default, but you can customize the apps Siri has access to at any time".
There is much more info. in that linked article above.
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Re: "(It would be nice if Apple would include a toggle to shut off any and all AI features entirely but I doubt that will happen)"
If you use Screen Time: Seems we can also: Block access to Apple Intelligence features in Screen Time on Mac
Eg: says:
"You can turn on Content & Privacy Restrictions in Screen Time to restrict access to certain Apple Intelligence* features like Writing Tools, image creation features and intelligence extensions on supported devices." (More info in linked article.)
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If you wish: Feature requests can be sent to Apple using the feedback web-forms provided via the feedback website :
Product Feedback - Apple