To delete your Grok chat history on grok.com/app and X, open your chat, select...

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 on grok.com/app and X, open your chat, select the delete option, and confirm. Remember, deleted chats move to Recently Deleted where they stay for 30 days before permanent removal