function plt_hide_related_posts_by_themeinprogress_menus() {
//Hide the "TIP Plugins" menu.
remove_menu_page('tip_plugins_panel');
//Hide the "TIP Plugins → Related Posts by ThemeinProgress" menu.
remove_submenu_page('tip_plugins_panel', 'tiprp_panel');
}
add_action('admin_menu', 'plt_hide_related_posts_by_themeinprogress_menus', 12);