Lit: Literary Review Visual Style

I have been bothered by how much easier I find reading online in Author (and other similar layout programs) than the PDFs so I put up an album on Facebook to see what my friends think, if they think it’s no big deal or interesting:

Conclusion seems to be a preference for single column without clutter which should not be too wide but should also not waste space so multiple windows work for some and full frame for others, while in concentration mode.