understrap/page-templates/both-sidebarspage.php

<?php
/**
 * Template Name: Left and Right Sidebar Layout
 *
 * This template can be used to override the default template and sidebar setup
 *
 * @package understrap
 */

get_header();
$container = get_theme_mod( 'understrap_container_type' );
?>

<div class="wrapper" id="page-wrapper">


	<div class="wrapper" id="page-wrapper">

		<div class="<?php echo esc_html( $container ); ?>" id="content">

			<div class="row">

				<?php get_sidebar( 'left' ); ?>

				<div
					class="<?php if ( is_active_sidebar( 'left-sidebar' ) || is_active_sidebar( 'right-sidebar' ) ) : ?>col-md-4<?php else : ?>col-md-12<?php endif; ?> content-area"
					id="primary">

					<main class="site-main" id="main" role="main">

						<?php while ( have_posts() ) : the_post(); ?>

							<?php get_template_part( 'loop-templates/content', 'page' ); ?>

							<?php
							// If comments are open or we have at least one comment, load up the comment template.
							if ( comments_open() || get_comments_number() ) :
								comments_template();
							endif;
							?>

						<?php endwhile; // end of the loop. ?>

					</main><!-- #main -->

				</div><!-- #primary -->
				<?php get_sidebar( 'right' ); ?>
			</div><!-- .row -->

		</div><!-- Container end -->

	</div><!-- Wrapper end -->

	<?php get_footer(); ?>