Just like to know which one is the php file to modify contact form fields (I want "Telf" instead of "Subject" for example. Or maybe add more fields...) and I have only found this code in template-contact.php:

// Contact Form

?>

<div id="contact-page-content" class="row">

<div class="contact-form-column col-md-<?php echo esc_attr( $col_form_width ); ?>">

<?php

if ( class_exists( 'Engage_Core' ) ) {
echo do_shortcode( '[engage_contact_form]' );
} else {
echo '<p class="engage-core-absence">' . esc_html__( 'Please install and activate the Engage Core plugin to use the contact form.', 'engage' ) . '</p>';
}

?>
   
    </div>
    
    <?php
    
    if ( engage_option( 'contact_layout' ) != 'fullwidth' ) {
     l
    echo '<div class="contact-content-column col-md-' . $col_content_width . '">';
    
    // Page Content Loop
    
    if (have_posts()) : while (have_posts()) : the_post(); 
            
    the_content(); 
   
    wp_link_pages();
              
    endwhile; endif; 
    
    echo '</div>';
    
    }
    
    ?>
    
    </div>
    
    </div>

Thanks