For example, when viewing this question at Biostars in a window covering half my screen horizontally, the page defaults to some kind of mobile-like layout:
When I expand the window to cover around 2/3 of the horizontal space, the page changing to a more desktop-like version:
I noticed that this also depends on the zoom level, if I zoom further out, I can view the desktop layout in the smaller window. However, at such zoom levels, the text is illegible.
I much prefer the desktop layout and wonder if there is a way to prevent web sites from changes the layout automatically when being viewed in a smaller window. I would not mind having a horizontal scroll bar. I am using Chromium 44.0.2403.89 on Ubuntu 15.04 (64-bit).