function plt_hide_pressenter_menus() {
//Hide the "PressEnter" menu.
remove_menu_page('pressentation');
//Hide the "PressEnter → Presentations" menu.
remove_submenu_page('pressentation', 'pressentation');
//Hide the "PressEnter → Add new" menu.
remove_submenu_page('pressentation', 'new-pressentation');
}
add_action('admin_menu', 'plt_hide_pressenter_menus', 11);