To delete your Grok chat history, go to grok.com/app and remove chats...

https://blogfreely.net/samuel-wang09/should-i-export-grok-data-before-i-delete-chat-history

To delete your Grok chat history, go to grok.com/app and remove chats individually or in bulk. Don’t forget to clear the Recently Deleted folder, where data stays for 30 days before permanent removal