default_option.php

См. документацию.

<?php
$iblock_default_option = [
    'use_htmledit' => 'Y',
    'show_xml_id' => 'N',
    'path2rss' => '/upload/',
    'combined_list_mode' => 'N',
    'iblock_menu_max_sections' => '50',
    'list_image_size' => '50',
    'detail_image_size' => '200',
    'event_log_iblock' => 'Y',
    'num_catalog_levels' => '3',
    'seo_max_stores' => '20',
    'custom_edit_form_use_property_id' => 'Y',
    'list_full_date_edit' => 'N',
    'property_features_enabled' => 'Y',
    'iblock_activity_dates' => '',
    'iblock_activity_dates_period' => '86400',
    'excel_export_rights' => 'N',
    'change_user_by_group_active_modify' => 'N',
];