How to set Featured Image as Background Cover with Title and Sub Title

Create a hook in functions.php

//ADD COVER TO ONLY SUB PAGES
function add_background_cover(){
    if ( !is_front_page() ) {
        include('inc/cover.php');
    }
}
add_action('genesis_after_header', 'add_background_cover');

Create a file inc/cover.php and place the following snippet in it. Don’t forget to replace the ACF slug in cover_subtitle() function!

<?php

//Cover Background
function cover_background() { 
    
    function cover_subtitle() { 
    if( get_field('........') ){ the_field('........') }
            else{ echo 'Hello World!'; }
        }
    
    $bgImage = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full' ); 
    if( has_post_thumbnail() ){ ?>
            <section class="cover" style="background-image: url('<?php echo $bgImage[0]; ?>'); ">
                <h1 class="entry-title" itemprop="headline"><?php the_title(); ?></h1>
                <p><?php cover_subtitle(); ?></p>
            </section>
        <?php }
        else{  ?>
            <section class="cover" style="background-image: url(..............); ">
               <h1 class="entry-title" itemprop="headline"><?php the_title(); ?></h1>
                <p><?php cover_subtitle(); ?></p>
            </section>
            <?php
             }
    }
cover_background();
?> 

CSS

 .cover {
	height: 280px;
	padding-top: 60px;
}