How to Hide Defender Admin Menus

function plt_hide_defender_security_menus() {
	//Hide the "Tools → Scheduled Actions" menu.
	remove_submenu_page('tools.php', 'action-scheduler');
	//Hide the "Defender" menu.
	remove_menu_page('wp-defender');
}

add_action('admin_menu', 'plt_hide_defender_security_menus', 11);

Where do I put this code?