Small diamonds on the top right of each page provide accordion folding inside the body of most pages:
The hollow diamond () opens all subheadings on the page.
The solid diamond () closes all subheadings that can be closed. Best Practice sections are left open and do not close.
The diamonds are “sticky”, meaning that the next page you open will come up with the last setting you used. This is viewed as an accessibility feature, set it and forget it.