Hello @Karl Birch, @B_R,
Thank you very much for sharing your feedback and for taking the time to provide detailed information. I truly appreciate it.
At the moment, there is no user-level option available to permanently turn off or remove the Copilot icon in Excel. I understand how disruptive and frustrating this experience can be, especially when it affects your daily work, and I do agree that having a simple setting to disable it would be very helpful.
As a current workaround, if you are using a work or school account, you may consider reaching out to your IT Administrator / Microsoft 365 administrator. They can:
Please note that this requires administrative access and may not apply to personal subscriptions.
In the meantime, I would also encourage you to submit feedback directly to Microsoft product team through the Microsoft Feedback Portal. User feedback plays an important role in influencing future improvements, and requests like yours help highlight the need for better control over features like this.

- Fill in the form and click Send to submit your feedback.
The Product Team is in-charge of the feedback site, and they are constantly checking the comments and feedback from our customer. Many features have been developed or improved based on users' comment.
After submitting your request on the site, you can return here and paste the link into this thread. That way, other users who visit this discussion can click the link and upvote your request to help bring more attention to it.
Just to be transparent, I’m a Q&A forum moderator here, but you can think of me as a user like yourself. I don’t have the ability to change product behavior directly or represent the Microsoft product team. What I can do, though, is share context around how things work today and help guide you toward the most effective next steps.
I sincerely understand the inconvenience this has caused, and I appreciate your patience and understanding while we work within the current situation. However, please know that you are not alone in experiencing this. I will continue to monitor this case and keep an eye on any updates. If there are any changes or new information regarding this feature, I will make sure to share them with you promptly.
Please let me know if there’s anything else I can assist you with. Thank you again for reaching out!