Aspose::Words::Saving::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 in C++.... auto doc = System :: MakeObject < Aspose...set_NavigationMapLevel ( 2 ); doc -> Save ( get_ArtifactsDir ()...