.settings.php

См. документацию.

<?php
return [
    'controllers' => [
        'value' => [
            'defaultNamespace' => '\Bitrix\Iblock\Controller',
            'restIntegration' => [
                'enabled' => true,
            ],
            'namespaces' => [
                '\Bitrix\Iblock\Controller' => 'api'
            ]
        ],
        'readonly' => true,
    ],
    'ui.entity-selector' => [
        'value' => [
            'entities' => [
                [
                    'entityId' => 'iblock-element-user-field',
                    'provider' => [
                        'moduleId' => 'iblock',
                        'className' => '\Bitrix\Iblock\Integration\UI\EntitySelector\ElementUserFieldProvider',
                    ],
                ],
                [
                    'entityId' => 'iblock-section-user-field',
                    'provider' => [
                        'moduleId' => 'iblock',
                        'className' => '\Bitrix\Iblock\Integration\UI\EntitySelector\SectionUserFieldProvider',
                    ],
                ],
                [
                    'entityId' => 'iblock-element',
                    'provider' => [
                        'moduleId' => 'iblock',
                        'className' => '\Bitrix\Iblock\Integration\UI\EntitySelector\IblockPropertyElementProvider',
                    ],
                ],
                [
                    'entityId' => 'iblock-property-element',
                    'provider' => [
                        'moduleId' => 'iblock',
                        'className' => '\Bitrix\Iblock\Integration\UI\EntitySelector\IblockPropertyElementProvider',
                    ],
                ],
                [
                    'entityId' => 'iblock-property-element-xml',
                    'provider' => [
                        'moduleId' => 'iblock',
                        'className' => '\Bitrix\Iblock\Integration\UI\EntitySelector\IblockPropertyElementXmlProvider',
                    ],
                ],
                [
                    'entityId' => 'iblock-property-section',
                    'provider' => [
                        'moduleId' => 'iblock',
                        'className' => '\Bitrix\Iblock\Integration\UI\EntitySelector\IblockPropertySectionProvider',
                    ],
                ],
            ],
        ],
        'readonly' => true,
    ],
];