Display options in original aspect ratio

Dear who may concern.

I am a librarian in Seoul National University in South Korea.

Actually our library started to use IA Book Reader on 1 September, 2015 for viewing Old Book Digital Collection.

Sample collection is http://snu-primo.hosted.exlibrisgroup.com/82SNU:ALL:82SNU_ROSETTA3954084.

But we encountered one problem to view.

The most of images are displayed portrait basically. But in such case as some images are scanned in landscape, the viewer shows still portrait so that users hardly recognize the image.
We want all images to be displayed in original aspect ratio.

See the below link and fine from 28 to 31 pages)
http://rosetta-app.snu.ac.kr:1801/delivery/DeliveryManagerServlet?change_lng=en&dps_custom_att_1=staff&dps_pid=IE702491
(from 28 to 31 page)
You can view the original pages in new tab.

I know it is not a bug thing, but we need to configure or set up the Viewer.

Please give some idea.

Best Regards
Hye Young