Not sure if I am missing something but there doesn't seem to be an option to enable a single image to be clicked and opened up into full screen or a pop up, whatever you wish to call it.
I can see you can set up a multitude of other options like links to pages and such when the single image is clicked but not a simple pop up/enlarge/full screen view.
I tried a workaround by using a pro gallery image set with just one image but the pro gallery option behaves differently to a single image when it comes to the way it sits on your page and adapts to different viewports. I played around with this all morning and I just wasn't happy with it.
I was just under the impression that a single image pop up would be straightforward to set up and a much used feature on single images. Confused as pretty much every other option is available to set up when a single image is clicked.
Any advice would be appreciated. Cheers