Displaying PDFs side-by-side

Hi,

I saw a post from a few years ago saying in a previous version the option to see PDFs two across is now available in ARI Fancy Lightbox. Can you guide me through the process? We’re running the most current version of the plugin and of WordPress, on Gutenberg. I’ve been able to get it to add the PDFs, but not any way to format it or alter the display once it’s added.

Thanks so much!