Form/Items/EmailItem.php
public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        $builder->remove('isFirstname');
        $builder->remove('isName');

        $builder->add('replyTo', CheckboxType::class, [
            'label' => 'Reply to this Email',
            'required' => false,
        ]);

        $builder->add('isReceiver', CheckboxType::class, [
            'label' => 'Is Receiver',
            'required' => false,
        ]);
    }
public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        $builder->remove('isFirstname');
        $builder->remove('isName');

        $builder->add('replyTo', CheckboxType::class, [
            'label' => 'Reply to this Email',
            'required' => false,
        ]);

        $builder->add('isReceiver', CheckboxType::class, [
            'label' => 'Is Receiver',
            'required' => false,
        ]);
    }
{@inheritdoc}