[Theme: Merlin] Remove Featured Image from Post

Hello, I need help for removing Featured Image from every blog post I made, but I want it to keep displayed at the blog roll in my homepage.

I have read several help topics in the forum, and it looks like this is a theme-related issue.

From what I know, I should remove <?php if( has_post_thumbnail() ) : ?> from single.php, however I didn’t find it.

This is the code at single.php:

‘<?php
/**
* The template for displaying all single posts.
*
* @package Merlin
*/

get_header(); ?>

<section id=”primary” class=”content-area”>
<main id=”main” class=”site-main” role=”main”>

<?php while (have_posts()) : the_post();

get_template_part( ‘template-parts/content’, ‘single’ );

comments_template();

endwhile; ?>

</main><!– #main –>
</section><!– #primary –>

<?php get_sidebar(); ?>

<?php get_footer(); ?>’

Can anyone help me where to look the thumbnail code?
Your help will be really appreciated.

Thank you.