Each page on the LibreTexts has a classification, which can be view via the Page Settings expandable
The page settings can be expanded or collapsed via the "plus" button on the top.
The settings vary slightly with the library, with STEM libraries being somewhat richer with computational apps but here is the social sciences library version
You can insert a small picture in the Thumbnail and a couple of tweets worth of text in the Summary. These will be displayed in the guide.Most of the other pull down menus are self explanatory. The article type allows you to change the type of the article between book, chapter or page. Be careful with this it can seriously mess up the directory system in your book.
Show TOC should only be used for pages or sections with content not for chapters or books. It displays a small table of contents at the top of the page which can be folded up or expanded as shown below
If you mess up, you can always find the page you called a chapter, or the chapter you named as a page by clicking on the small folder at the top of the blue bar. Then you can go to there and change the article type in the Page Settings