If you want to turn off Copilot in a Microsoft 365 app (for example, Word, PowerPoint, and Excel), you can clear the Enable Copilot checkbox in the app on your Windows or Mac device. When you turn off Copilot in an app, the Copilot icon on the ribbon is disabled and you won't be able to use any Copilot capabilities in that app.
However, this option is not available, and Microsoft is working on adding the Enable Copilot checkbox to Excel, OneNote, and PowerPoint on Windows devices and to Excel and PowerPoint on Mac devices. That is tentatively scheduled to happen in February 2025. In the meantime, you can change your privacy settings to turn off Copilot.
Change your privacy settings to turn off Copilot:
If your Microsoft 365 apps don't yet have the Enable Copilot checkbox, you can turn off Copilot by changing your account privacy settings.
But, when you change your account privacy settings to turn off Copilot, you're also turning off other features in your Microsoft 365 apps that you might want to use. For example, suggested replies in Outlook, text predictions in Word, PowerPoint Designer, and automatic alt text for images. For a list of features that would be turned off, see Connected experiences in Office.
Change privacy settings on Windows devices:
- In your app (for example, PowerPoint), go to File > Account > Account Privacy > Manage Settings.
- Under Connected experiences, clear the Turn on experiences that analyze your content checkbox.
- Select OK, and then close and restart the app.
You only have to change your privacy settings in one of the apps. The change will take effect in the other apps next time you open them.
Change privacy settings on Mac devices:
In your app (for example, Word), select the app menu, and then go to Preferences > Personal Settings > Privacy.
In the Privacy dialog, go to Connected Experiences > Manage Connected Experiences.
Clear the Turn on experiences that analyze your content checkbox.
Select OK, and then close and restart the app.
You only have to change your privacy settings in one of the apps. The change will take effect in the other apps next time you open them.
Ref: https://support.microsoft.com/en-us/office/how-to-turn-off-copilot-in-microsoft-365-family-and-personal-subscriptions-bc7e530b-152d-4123-8e78-edc06f8b85f1#:%7E:text=If%20you%20want%20to%20turn%20off%20Copilot%20in,the%20app%20on%20your%20Windows%20or%20Mac%20device.