xiaowang/kirby/config/areas/users/searches.php

<?php

use Kirby\Cms\App;
use Kirby\Toolkit\Escape;
use Kirby\Toolkit\I18n;

return [
	'users' => [
		'label' => I18n::translate('users'),
		'icon'  => 'users',
		'query' => function (string $query = null) {
			$users   = App::instance()->users()->search($query)->limit(10);
			$results = [];

			foreach ($users as $user) {
				$results[] = [
					'image' => $user->panel()->image(),
					'text'  => Escape::html($user->username()),
					'link'  => $user->panel()->url(true),
					'info'  => Escape::html($user->role()->title())
				];
			}

			return $results;
		}
	]
];