To delete your Grok chat history on grok.com/app and X, go to your chat...

https://domgodwinson38.gumroad.com/p/how-do-i-delete-files-from-grok-the-ones-people-forget-a-full-cleanup-guide

To delete your Grok chat history on grok.com/app and X, go to your chat settings and select "Delete History." Remember, this won’t remove any files or Imagine media, which you need to delete separately in their own sections