Board Thread:Darwin/@comment-5275700-20131113005820/@comment-14779707-20131204122755

You don't need to do anything special to use it. It is enabled by default. However, Fluid does the following:
 * 1) Make the rails smaller, so that there is more space for content.
 * 2) Make the rails disappear (the ads will go down) on tablet devices,. On a computer, you can simulate this by zooming in to 150%, just to see how a tablet user will see your wikia.