ultimatemember/includes/admin/templates/directory/sorting.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

global $post_id;


$_um_sorting_fields = get_post_meta( $post_id, '_um_sorting_fields', true );
$_um_sorting_fields = empty( $_um_sorting_fields ) ? array() : $_um_sorting_fields; ?>

<div class="um-admin-metabox">

	<?php $fields = array(
		array(
			'id'            => '_um_sortby',
			'type'          => 'select',
			'label'         => __( 'Default sort users by', 'ultimate-member' ),
			'tooltip'       => __( 'Default sorting users by a specific parameter in the directory', 'ultimate-member' ),
			'options'       => UM()->member_directory()->default_sorting,
			'value'         => UM()->query()->get_meta_value( '_um_sortby' ),
		),
		array(
			'id'            => '_um_sortby_custom',
			'type'          => 'text',
			'label'         => __( 'Meta key', 'ultimate-member' ),
			'tooltip'       => __( 'To sort by a custom field, enter the meta key of field here', 'ultimate-member' ),
			'value'         => UM()->query()->get_meta_value( '_um_sortby_custom', null, 'na' ),
			'conditional'   => array( '_um_sortby', '=', 'other' )
		),
		array(
			'id'        => '_um_enable_sorting',
			'type'      => 'checkbox',
			'label'     => __( 'Enable custom sorting', 'ultimate-member' ),
			'tooltip'   => __( 'Whether to provide an ability to change the sorting on the directory page', 'ultimate-member' ),
			'value'     => UM()->query()->get_meta_value( '_um_enable_sorting' ),
		),
		array(
			'id'                    => '_um_sorting_fields',
			'type'                  => 'multi_selects',
			'label'                 => __( 'Choose field(s) to enable in sorting', 'ultimate-member' ),
			'value'                 => $_um_sorting_fields,
			'options'               => UM()->member_directory()->sort_fields,
			'add_text'              => __( 'Add New Field', 'ultimate-member' ),
			'show_default_number'   => 1,
			'conditional'           => array( '_um_enable_sorting', '=', 1 )
		)
	);

	UM()->admin_forms( array(
		'class'     => 'um-member-directory-sorting um-half-column',
		'prefix_id' => 'um_metadata',
		'fields'    => $fields
	) )->render_form(); ?>

	<div class="um-admin-clear"></div>
</div>