remove right sidebar and center the content

and single.php:

<?php get_header(); ?>
<div class="row">
<section class="nine columns main-container">
  <?php if (have_posts()) :  while (have_posts()) : the_post(); ?>
  	<article <?php post_class('post'); ?> id="post-<?php the_ID(); ?>">

		  <?php
		    // The following determines what the post format is and shows the correct file accordingly
		    $format = get_post_format();
		    if ($format) {
		    get_template_part( 'inc/postformats/'.$format );
		    } else {
		    get_template_part( 'inc/postformats/standard' );
		    }
		  ?>
		  <div class="post-title">
		  	<aside><?php echo thb_DisplaySingleCategory(true); ?></aside>
		  	<h1><?php the_title(); ?></h1>
		  </div>
		  <aside class="post-meta">
		  	<ul>
		  		<li><?php _e( 'By', THB_THEME_NAME ); ?> <strong><?php the_author_posts_link(); ?></strong></li>
		  		<li>&bull;  &nbsp; <?php echo get_the_date('j. F Y'); ?></li>
		  	</ul>
		  </aside>
		  <div class="post-content">
		  	<?php get_template_part( 'inc/postformats/post-meta' ); ?>
		  	<?php the_content(); ?>
		  	<?php if ( is_single()) { wp_link_pages(); } ?>
		  </div>

  	</article>
  <?php endwhile; ?>
  	<?php get_template_part( 'inc/postformats/post-review' ); ?>
  <?php else : ?>
    <p><?php _e( 'Please add posts from your WordPress admin page.', THB_THEME_NAME ); ?></p>
  <?php endif; ?>
  	<?php get_template_part( 'inc/postformats/post-prevnext' ); ?>
  	<?php get_template_part( 'inc/postformats/post-related' ); ?>
  	<?php get_template_part( 'inc/postformats/post-endbox' ); ?>
  	<!-- Start #comments -->
  	<section id="comments" class="cf">
  	  <?php comments_template('', true ); ?>
  	</section>
  	<!-- End #comments -->
</section>
  <?php get_sidebar('single'); ?>
</div>
<?php get_footer(); ?>

You should contact your theme author about this: https://themeforest.net/user/fuelthemes

Thank you, but they don’t solve custom theme edits, they only help with bugs etc..

Remove this from the single.php:
<?php get_sidebar('single'); ?>

To get rid of the sidebar.

Thank you, but it only removes the sidebar..

It doesnt center the content.

change this line:

<section class="nine columns main-container">

to:

<section class="twelve columns main-container">

Awesome! Thank you very much..

Is there also a way to keep the width as it was?

Is there also a way to keep the width as it was?

reverse the CSS class edit in single.php, i.e. change back to the original .nine;

then add something like this to the styles of your theme, ideally via a custom CSS plugin:

.single .nine { float: none; margin-left: auto; margin-right: auto; }