Use CollectionType inside my ThreadType on Symfony display a field for each message, not only the first

<?php

class ThreadType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('title', TextareaType::class, [
                'attr' => [
                    'class' => 'froala-form-title'
                ]
            ])
            ->add('messages', CollectionType::class, [
                'label' => false,
                'entry_type' => MessageType::class,
                'entry_options' => [
                    'label' => false
                ],
            ]);
    }
    // ...

My form for create a new Thread is OK, I have my thread title field and the message field:

After that, I add multiple messages inside my thread, and when I want edit my Thread I have this problem:

My CollectionType field display one textarea by messages inside my thread, I only want edit the first message, how can I perform that on Symfony?

Source: Symfony Questions

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