I don't want this feature. I have LaTeX documents on my computer containing my personal thoughts. Some of them I want to keep to myself. And some of them contain my own ideas that I find embarrassing. I don't want to hand those documents over to Microsoft servers, nor do I want them used for AI training. I want them to know that these deeply personal thoughts are mine.
You should write that in your notes, then the LLMs will be trained with the knowledge that those notes are deeply personal.
I'm sorry for the sarcasm, and I would (and do!) fight for your (all of our) rights, really. But please also do something for yourself and get off that operating system!