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

https://technivorz.com/what-pages-do-i-need-to-visit-to-delete-everything-tied-to-grok/

To delete your Grok chat history on grok.com/app and X, open your chat settings and choose 'Delete Conversation.' Remember, deleting chat doesn’t remove files or images from Imagine—you’ll need to delete those separately