Update 25 Apr 2025:
Hi Everyone,
Just to update:
FINALLY, for Enterprise subscription, Microsoft provided the function to make the icon disappeared.
You can set in the Excel Options now:

My Apps version:

Thanks all the amazing solution provided under this thread.
And also HUGE KUDOS to engineers who fix this function.
b( ̄▽ ̄)d
BR,
YL
-------------------------Below is the original issue-------------------------
Dear Team,
Kindly ask is there any option to disable the floating Copilot icon in Excel?
Sincerely I've been driven MAD by this floating icon. As normal users, we don't really need to use Copilot EVERYWHERE in the Excel. Will it be possible that in the future the team can work out a better way to toggle the Copilot function instead of keeping the icon floating?
Btw, the UI of the floating icon is also dysfunction --> keep trembling and shaking, which only distract users' attention.

The Disable function can ONLY work when I keep the file open --> so it still there when I reopen the workbook. This makes no sense at all.

No where in the "Option" panel I can find the disable function. Though there is someone on the Internet teaching us how to disable it using VBA. Anyway, this method is too much and too retro for normal user.
Truly thankful if this bug can be fixed SOON. This is really killing users who need to use Excel like 6-8 hours a day. We just need a smooth Excel function.
Best Regards,
YL