Universal Viewer Two Page View

Hi,
I’m having trouble configuring the universal viewer. I am trying to get the viewer show a two page book style view for a PDF. The viewer works but I can not get the two page facing option to show up. I have edited the iiif server settings and the the config.json file but nothing seems to change the module setting. Does anyone know what to do here?
Thank you.

I’ve edited the config files in the universal-viewer/asset/ folder with the documentation that is posted here
But the viewer doesn’t seem to update. What am I doing wrong?