Gamevase

In the default Gutenberg gallery, whenever you click a gallery image, you either navigate to another page and see the linked image or you cannot click and see a bigger version of the image at all.
This plugin shows Gutenberg gallery images in a lightbox on the same page.

Simple Gallery Lightbox

Adds a simple lightbox to default Gutenberg gallery.

Silkalns

Seamlessly integrates FancyBox into your blog: Upload, activate, and you’re done. Additional configuration optional.
You can easily customize almost anything you can think about fancybox lightbox: the border, margin width and color, zoom speed, animation type, close button position, overlay color and opacity and even more advanced option like several options to group images into galleries, and more…
By default, the plugin will use jQuery to apply FancyBox to ANY thumbnails that link directly to an image. This includes posts, the sidebar, etc, so you can activate it and it will be applied automatically.
<h4>Further Reading</h4>
This plugin is developed and maintained by Colorlib. Which is well know for their free <a href="https://colorlib.com/wp/themes/" rel="nofollow ugc"></a>WordPress themes. However, now they are looking to extend their presence in plugin development and believe that FancyBox lightbox is a great way to start.
If you are new to WordPress and want to lear more we have got you covered. Colorlib will teach you have to <a href="https://colorlib.com/" rel="nofollow ugc">start a blog</a> or <a href="https://colorlib.com/wp/how-to-make-a-website/" rel="nofollow ugc">create a website</a> and much more. If you are already familiar with WordPress you likely want to learn how to make it faster and more reliable. That’s when you want to look into hosting and more specifically <a href="http://colorlib.com/wp/wordpress-hosting" rel="nofollow ugc">WordPress hosting</a>.
If you enjoy using FancyBox lightbox for WordPress please leave a <a href="https://wordpress.org/support/plugin/fancybox-for-wordpress/reviews/?filter=5" rel="ugc">positive feedback</a>. We are committed to make it the best lightbox plugin for WordPress.

FancyBox for WordPress

Seamlessly integrates FancyBox lightbox into your WordPress blog: Upload, activate, and you're done. Additional configuration optional.

Simple Gallery Lightbox vs FancyBox for WordPress