It's not reasonable to expect to be able to turn off "any part" of a piece of software, unless it's open source and you're digging through the code yourself to remove sections of it, refactor and re-compile everything.
That said, Apple generally gives people very fine-grained controls over what software features they want enabled, at least compared to other closed-source software vendors.
My question "what part and why" was intended to open up a discussion about privacy in regards to Apple's AI. But if your answer is simply "none of your business", then my answer to the question "can I turn it off" is simply "nobody has any way of knowing yet." Neither of those answers are great discussion openers.
Your username seems to check out.
