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The built-in CSS rules are in [PLUGIN_DIR]/css/p-bookmap-frontmatter-backmatter.css. By default, it associates the <oxy:front-matter> and <oxy:back-matter> elements with the matter page, that has no headers or other page margin boxes. Each of the child topics start on a new page.

The content of this file is:

@media print {

    front-matter,
    back-matter {
        page: matter-page;
    }
    
    /* Put the sections on a separate page. */
    front-matter > *[class ~= "topic/topic"], 
    back-matter > *[class ~= "topic/topic"]{
      page-break-before: always;
    }
}
Note: This is listed solely for illustration purposes, as the plugin might use something different.