October CMS. How to change the title of the record output page using the RecordDetails component?

Question

PHP

Hello. I've already seen a similar question here, but still couldn't find an answer. Those. I found it, but I can’t use it, because perfect teapot in the backend Entry

page available

title = ""
url = "object/:slug"
layout = "default"
is_hidden = 0
robot_index = "index"
robot_follow = "follow"

[builderDetails]
modelClass = "AdminAdmin\Flats\Models\Flats"
identifierValue = "{{ :slug }}"
modelKeyColumn = "slug"
displayColumn = "slug"
notFoundMessage = "Публикация не найдена"
==
<?php
function onEnd() {
    $this['record'] = $record = $this->builderDetails->record;
    $this->page->title = $record->title;
}
?>
==
{% set displayColumn = builderDetails.displayColumn %}
{% set notFoundMessage = builderDetails.notFoundMessage %}


<!-- Header -->
{% partial 'header' %}


{% if record %}
<!-- Object -->
<section class="section">
<div class="container">
    <h1 class="section-title object-title">{{ record.title }}</h1>
    <p class="object-address">{{ record.address }}</p>
Ну и дальше там идет верстка, которая не имеет отношения к вопросу

This onEnd() function, as I googled, should display the title of the record (record.title) in the title of the record (title = ""). But, nothing works. Tell me, please, how to the most real teapot, how to pull up the title when creating a post and throw it in the page title? Thank you)