How to Hide Hreflang Manager Admin Menus

function plt_hide_hreflang_manager_lite_menus() {
	//Hide "Hreflang".
	remove_menu_page('daexthrmal_connections');
	//Hide "Hreflang → Connections".
	remove_submenu_page('daexthrmal_connections', 'daexthrmal_connections');
	//Hide "Hreflang → Tools".
	remove_submenu_page('daexthrmal_connections', 'daexthrmal_tools');
	//Hide "Hreflang → Options".
	remove_submenu_page('daexthrmal_connections', 'daexthrmal_options');
	//Hide "Hreflang → Help  Support".
	remove_submenu_page('daexthrmal_connections', 'https://daext.com/doc/hreflang-manager');
}

add_action('admin_menu', 'plt_hide_hreflang_manager_lite_menus', 11);
Where do I put this code?