User blog comment:Rupert Giles/Global Navigation January Update/@comment-25669603-20150131191616/@comment-24025240-20150202054101

We decided to keep the nav fixed based on a few experiments we ran in December and January. Engagement with nav elements went down significantly when the nav was hidden (even if it returned immediately after scrolling up). Searches were down, clicks on notifications were down, log-ins were down, etc.

In addition, the vast majority of desktop and tablet traffic on Wikia comes from devices with a screen resolution of at least 768px in height. We felt that the fixed nav would not take up too much space for the great majority of our users.

With all that said, it can be difficult to create a universal experience that works for every configuration. As others have mentioned, personal CSS is available to you as an option for tweaking the experience to your liking.