Great, but needs to fix some issues

The app is great and I highly recommend it to all my friends, however this new update brought a change thats really annoying.

When you open a document (ePub) there are these thick white margins on the left and right side of the screen that narrow down your reading space, this is a major issue for me and the main reason I havent been using this app as much as I used to. Unfortunately there is no way to get rid of it.
If anyone has any suggestions Im all ears !

Torchwood2141 about Documents: File Manager & Docs, v5.7.8