Book Pages Don't Fill Screen

[CC268]

Hello,

I recently downloaded a book/guide to Adobe Digital Editions on my iPad Mini 4 and noticed that the pages don't fill the screen - there is a large white margin to the right (see attached photo). I reached out to the publisher as I thought this might of been an issue on their end. He said the same problem had been reported many times and that it was a problem within Adobe Digital Editions. He encouraged me to report this to Adobe, so here I am.

Any way Adobe can get this fixed?

Thanks.