## HtmlSaveOptions::get_NavigationMapLevel method Specifies the maximum level of headings populated to the navigation map when exporting to EPUB, MOBI, or AZW3 formats. Default value is **%3**. ```......styles **Heading 1**, **Heading 2** and **Heading 3**. You can set...options->set_NavigationMapLevel(2); doc->Save(get_ArtifactsDir()...