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

https://post-wiki.win/index.php/How_Do_I_Stop_Grok_from_Using_My_Chats_for_Training_on_Grok.com%3F

To delete your Grok chat history, go to grok.com/app and remove conversations there. Then, check X (formerly Twitter) if you’ve used Grok there and delete chats separately