Number Special Sections
Sections that are assigned a built-in special style aren’t numbered by default.
To number regular sections as well as special sections, set
sectnums and assign it a value of
= Title :sectnums: all
The assignment of appendix numbers isn’t affected by
sectnums as their section title prefixes are controlled by the attribute appendix-caption.
Book parts aren’t numbered by
sectnums either, instead, they’re controlled by