usersettings.php

См. документацию.

<?php
namespace Bitrix\Main\Filter;
class UserSettings extends EntitySettings
{
    private $whiteList = [];
 
    function __construct(array $params)
    {
        parent::__construct($params);
 
        $this->whiteList = isset($params['WHITE_LIST']) && is_array($params['WHITE_LIST'])
            ? $params['WHITE_LIST'] : [];
    }
 
    public function getWhiteList()
    {
        return $this->whiteList;
    }

    public function getEntityTypeName()
    {
        return 'USER';
    }

    public function getUserFieldEntityID()
    {
        return \Bitrix\Main\UserTable::getUfId();
    }
}