For anyone who may be still interested in an answer for this, it appears that what the 4 previous posts are referring to can be found in the “LIGHTGALLERY LIGHTBOX” extension/paid add-on, not the free version. I noticed the div class was “lg-..” If you are a developer you can verify by viewing source code in lightgallery-all.min.js.
(Header Menu above —-> Products—> Extensions)
I noticed in testing the “LIGHTGALLERY LIGHTBOX” part of the demo, that the share button results in “undefined” for twitter/sharing, either it’s not set-up to pull the correct title & info or not fully implemented. Because of this I cannot say if the extension will work out of box without some light additional coding. That is still a question for the plugin author.
I have used the free version of this plugin and it appears to integrate well with the native WordPress gallery. I recommend swipebox and the forked v1.4.5 | koko-ng minified .js file on GitHub that adds pinch zoom support.
Best to All!