Customize iOS11 Document Based App Template

Question

I need to do the following customizations on the provided iOS 11 Document Based App Template:

• A library with only my App files, as Procreate example App bellow
• Get rid of the sidebar browser, so I have a fullscreen that shows only my library. https://assets.procreate.art/video/home/mp4/block-10.mp4

I have asked Apple Code Level suport but still haven't got an answear. Can someone please help?

Thanks!