Adding two page to the settings for univesal viewer

I have a request to have Universal Viewer to display facing pages, two pages of the book.
I have tried to changing the Default Behavior in the IIIF Server module to “Facing Pages” and other combinations but it does not seem to have any effect.

I do not have direct access to the server just to the Omeka S page as an admin.
What do I need to tell IT to change in the server side so the option is the default?