Disable Copilot in Microsoft Word by unchecking "Enable Copilot" under File > Options. Removing the Copilot icon from the ribbon won't fully disable the AI tool, but it can help keep your display tidy ...
On the desktop and in Windows Explorer, the entry “Ask Copilot” has been appearing in the context menu when right-clicking on a registered file type such as DOCX, TXT, PDF or PNG for a few weeks now.