Hello Justin,
It seems that Big Commerce is using it’s own template. You will need to override it.
To resolve this issue, 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
/**
* The content-wrapper.php template is responsible for rendering everything that goes between
* get_header() and get_footer() in the theme.
*
* @var string $content The contents of the page to render inside of the wrapper
*/
?>
<div class="x-container max width offset">
<div class="<?php x_main_content_class(); ?>" role="main">
<div class="entry-content">
<?php echo $content; ?>
</div>
</div>
<?php if ( $fullwidth != 'on' ) : ?>
<?php get_sidebar(); ?>
<?php endif; ?>
</div>
3] Save the file named as page-wrapper.php
4] Upload this file to your server in the child theme’s folder wp-content/themes/x-child/bigcommerce/components/
We would loved to know if this has work for you. Thank you.