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

https://stateofseo.com/how-do-i-handle-a-stubborn-grok-file-that-wont-delete/

To delete your Grok chat history on grok.com/app and X, go into your chat settings and choose “Delete Conversation.” Remember, chat history deletion does not remove files or Imagine media—they need to be deleted separately