Elgg-Lorea-Hydra/mod/groups/views/default/widgets/a_users_groups/edit.php

<?php
/**
 * Elgg group widget edit view
 *
 * @package ElggGroups
 */


// set default value
if (!isset($vars['entity']->num_display)) {
	$vars['entity']->num_display = 4;
}

$params = array(
	'name' => 'params[num_display]',
	'value' => $vars['entity']->num_display,
	'options' => array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20),
);
$dropdown = elgg_view('input/select', $params);

?>
<div>
	<?php echo elgg_echo('groups:widget:num_display'); ?>:
	<?php echo $dropdown; ?>
</div>