How to Hide the "Simple Export Import" Admin Menu

function plt_hide_simple_export_import_for_acf_data_menus() {
	//Hide the "Settings → Simple Export Import" menu.
	remove_submenu_page('options-general.php', 'seip-simple-export-import');
}

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

Where do I put this code?