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

https://mega-wiki.win/index.php/Why_Can%E2%80%99t_I_Delete_Grok_Generated_Images_on_X_One_by_One%3F

To delete your Grok chat history on grok.com/app and X, go to your chat settings and choose delete history. Remember, files and Imagine media don’t get deleted automatically—they need to be removed separately