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

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, go to your chat settings and choose the delete option. Remember, files and Imagine media aren’t removed automatically—they need to be deleted separately