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

https://sierra-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 on grok.com/app and X, go to your chat settings and select “Delete History.” Remember, this only removes chat messages