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TL;DR you can’t, don’t use
What is the point of this post if the answer is
A. Delete your meta account or
B. You can't turn it off.
So that you can share it with people around you and suggest them to use alternatives.
If nobody around you uses Meta products, great, but that's not the case for most of us
Wow, reading 'You can’t fully turn off Meta AI on XYZ' for almost every single thing makes me want to purge everything from existence.
Any toggle they provide is just a feel good toggle.
Burn it with fire.