Click over to the new graphical site map if disorder upsets you. The look of printed pages in books has not changed in five hundred years. No visual clues.
Progress is overdue.
This comes up most often when my commentary is interspersed with quoted material. In short, punchy paragraphs. In our analog past, classes were an hour long, regardless of the importance or difficulty of their content. Nothing is ever finished. It's this era's ah-ha.