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

https://atomic-wiki.win/index.php/How_to_Delete_Grok_History_if_Your_Account_is_Suspended_or_Deactivated

To delete your Grok chat history on grok.com/app and X, go to your chat settings and select “Clear History.” Remember, this only removes chats. Files and Imagine media must be deleted separately in their own sections