Delete Siri and dictation history on Mac
When you turn on Siri or turn on keyboard dictation, you can choose to share audio recordings of your Siri and dictation interactions on this Mac with Apple. Recordings are collected randomly and aren’t associated with your Apple ID.
You can remove the interactions made on this Mac from Apple servers (you must be connected to the internet).
On your Mac, choose Apple menu > System Preferences, then click Siri.
Click Delete Siri & Dictation History.
Important: Deleting Siri and dictation history doesn’t change the choice you made about sharing audio recordings. To change that setting, see Share analytics information from your Mac with Apple.