What I did to remove copilot and what you may want to try if it does show up this time:
Go into Word
Click on File at top of page
Click on options
Go to copilot (fourth choice down in the word options column)
Remove all check marks from the boxes of choices
Click okay
This may not work for you, but it did for me. From what I understand though, is that the system may still follow you or have access to what is done (and charge you for the service).
Good Luck - this is the only way it worked for me - don't think I can assist in any other way