In Photography version 4.3 or later. We added new premium lightbox plugin “ModuloBox” along with previous one “iLightbox”.

To switch between these lightbox options. Navigate to Appearance > Customise > Gallery > Lightbox > Lightbox Plugin

You can also customise many lightbox options there including skin color, overlay bacground opacity, thumbnails etc.

ModuloBox lighbox screenshot

iLightbox lighbox screenshot