To delete your Grok chat history on grok.com/app or X, open your chat, choose...

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 or X, open your chat, choose delete, and confirm. Remember, deleted chats go to Recently Deleted and stay there for 30 days before permanent removal