As an instructor, if I create new or edit existing chapters in the chapter editor & I do not save my work, then navigate away from the editor page, all of my changes are lost, without any warning whatsoever. Could you please add a warning dialogue box if a user attempts to navigate away from the chapter editor page without having saved their work, giving them the option to choose whether or not to continue editing & save their work, or, navigate away from the page & lose their changes.