How to Hide the "Shortcode Enablr" Admin Menu

function plt_hide_shortcode_enablr_menus() {
	//Hide the "Settings → Shortcode Enablr" menu.
	remove_submenu_page('options-general.php', 'shortcode_enablr');
}

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

Where do I put this code?