I am meaning the Lytebox feature here on CiC - although it is possible you may not be able to see it - it doesn't work for everyone it seems.
What happens if you click on the image in your post above?
For me, the background darkens and the image can be 'click held' and dragged to the edge of the monitor, then released, as a means to 'preview' alternate crops.
It looks like this screen grab;
Best regards,