Hi there,
Thank you for using Olsen light
You can only create one image with these 3 images wrapped as one. But you can replace the default Olsen light slider with any third party one from www.ads-software.com plugin repository that might have the behaviour you want.
Do you want to add post title under the photo for listings and single posts?
If yes open single.php and content-entry.php and move
<?php if ( has_post_thumbnail() ) : ?>
<div class="entry-featured">
<a class="ci-lightbox" href="<?php echo esc_url( olsen_light_get_image_src( get_post_thumbnail_id(), 'large' ) ); ?>">
<?php the_post_thumbnail( 'post-thumbnail', array( 'itemprop' => 'image' ) ); ?>
</a>
</div>
<?php endif; ?>
before
<h2 class="entry-title" itemprop="headline">
<?php the_title(); ?>
</h2>
If you decide to proceed with this modification I would suggest you create a child theme, copy over the files you are editing and make the modifications there. This will allow your changes to survive future theme updates. If you directly edit the theme’s files, all changes will be lost once you update.
Have a look at this guide to learn more about child themes and how to create one https://www.cssigniter.com/ignite/beginners-guide-child-themes/
Let me know if you need additional help with this.