remove sidebar

You will need to go through the template files and remove any instances of <?php get_footer(); ?> you may also need to edit css for the content area to use the extra space.

I was able to remove sidebar and stretch content to full width for all pages (but not posts) by adding this to the style.css file

.fullwidth {
float: left;
margin 0;
padding: 0;
width: 100%;
}

On page.php change this

<div id=”content” class=”narrowcolumn” role=”main”>
to this

<?php if (is_page()) : ?>
<div id=”content” class=”fullwidth” role=”main”>
<?php else : ?>
<div id=”content” class=”narrowcolumn” role=”main”>
<?php endif; ?>

AND change <?php get_sidebar(); ?>

to this

<?php if (is_page()) : ?>
<?php else : ?>
<?php get_sidebar(); ?>
<?php endif; ?>

Visit my test site at https://qcretreat.lifesites.com.au/blog/?page_id=16

change this <?php if (is_page()) : ?> to <?php if (is_page() || is_single()) : ?>.