To delete your Grok chat history, go to grok.com/app and clear your...
https://wiki-book.win/index.php/What_Should_I_Do_if_Grok_Delete_All_Doesn%E2%80%99t_Show_on_Mobile%3F
To delete your Grok chat history, go to grok.com/app and clear your conversations there. Also, check your X account if you use it to chat with Grok