Hello David,
Thanks writing in!
Please be advised that the “Content Layout” in X > Theme Options > Layouts and Design will be applied globally. Once it is set to fullwidth, all of the pages will become fullwidth. To use the “Content Left, Sidebar Right” layout while making the single blog post display in fullwidth, you will need to modify the template file. Since you have your child theme active and ready, please follow these steps below:
1] Using Notepad or TextEdit or Sublime Text or any text editor, please create a new file in your local machine.
2] Insert the following code into that new file
<?php
// =============================================================================
// VIEWS/RENEW/WP-SINGLE.PHP
// -----------------------------------------------------------------------------
// Single post output for Renew.
// =============================================================================
$fullwidth = get_post_meta( get_the_ID(), '_x_post_layout', true );
get_header();
?>
<div class="x-container max width offset">
<div class="x-main full" role="main">
<?php while ( have_posts() ) : the_post(); ?>
<?php x_get_view( 'renew', 'content', get_post_format() ); ?>
<?php x_get_view( 'global', '_comments-template' ); ?>
<?php endwhile; ?>
</div>
</div>
<?php get_footer(); ?>
3] Save the file named as wp-single.php
4] Upload this file to your server in the child theme’s folder /wp-content/themes/x-child/framework/views/renew/
You will need to create the folder path since it does not exist in your child theme’s folder yet.
Please let us know how it goes.