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

https://lukasnpyy234.cavandoragh.org/how-do-i-delete-grok-chats-on-a-shared-computer-safely

To delete your Grok chat history, go to grok.com/app or your X account and remove conversations there. Remember, deleting chats won’t remove any files or Imagine media—you’ll need to delete those separately