To delete your Grok chat history on grok.com/app and X, open your chat, select...

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, open your chat, select the delete option, and confirm. Remember, deleted chats move to Recently Deleted where they stay for 30 days before permanent removal