Hi, SLB prioritizes the display of the image, but also accounts for the caption and a description of reasonable length to all fit in the window at the same time.
Enabling SLB’s Resize lightbox to fit in window setting is recommended to prevent large images from pushing the caption/description out of view.
For long descriptions, SLB allows the lightbox to extend beyond the window’s height so that visitors can scroll to view the full description. This allows descriptions of any length to be used without compromising the display of the media in the lightbox.
If you are experiencing different behavior than what is described above, please provide more details, including a link to a page exhibiting the issue you are experiencing, and I would be glad to reopen this ticket and take a look.
Thanks.