I found a solution to get what I need, I update the file with changing in order to works fine.
I changed the file size-guide.php from /wp-content/themes/woodmart/inc/integrations/woocommerce/modules.
I changed this lines:

<h4 class="wd-sizeguide-title">
					<?php echo esc_html( $sguide_post->post_title ); ?>
				</h4>

with this:

<h4 class="wd-sizeguide-title">
					<?php echo get_the_title( $sguide_post->ID ); ?>
				</h4>

and this:

<a class="wd-open-popup" rel="nofollow" href="#woodmart_sizeguide">
					<span><?php esc_html_e( 'Size Guide', 'woodmart' ); ?></span>
				</a>

to this:

				<a class="wd-open-popup" rel="nofollow" href="#woodmart_sizeguide">
					<span><?php echo get_the_title( $sguide_post->ID ); ?></span>
				</a>

I try to use the child theme in order to avoid overriding for the future theme update but even I try to recreate the directory path it doesn’t work.

Do you have any suggestion?