I made the full width template. It is being used on "The Center" page.
-<?php if (is_front_page()) { ?>
+<?php if (is_front_page() && '$index_template = false') { ?>
<div id="main-content" class="small-12 columns">
<?php if(have_posts()) : while(have_posts()): the_post();?>
<?php the_content();?>
}
?>
</div>
+ <?php if (get_page_template_slug( $post->ID ) == "template-fullwidth.php") { ?>
+ <?php $index_template = false; ?>
+ <div id="fullwidth-template" class="row large-collapse">
+ <?php get_template_part('parts/main-content');?>
+ </div>
+ <?php } else { ?>
<div class="row large-collapse">
<?php get_template_part('parts/main-content');?>
<div id="sidebar" class="text-center small-12 large-text-left large-4 columns">
<?php the_field('sidebar_3');?>
</div>
</div>
+ <?php } ?>
</div>
</main>
\ No newline at end of file
--- /dev/null
+<?php
+/*
+Template Name: Full-Width Interior Page
+*/
+get_template_part('index');
+?>