function plt_hide_so_widgets_bundle_menus() {
//Hide the "Plugins → SiteOrigin Widgets" menu.
remove_submenu_page('plugins.php', 'so-widgets-plugins');
//Hide the "SiteOrigin" menu.
remove_menu_page('admin.php?page=siteorigin-installer');
}
add_action('admin_menu', 'plt_hide_so_widgets_bundle_menus', 12);