Board Thread:Support Requests - Designing Your Wikia/@comment-25278766-20150820153356/@comment-4731838-20150821172052

The mobile skin is different than the "normal" skin. You can switch to full-site by clicking Full-site at the bottom right. Similarly, you can view mobile skin from desktop using ?useskin=wikiamobile at end of the url. You can also use this script for easy switching.

But I got a feeling what you saw might be one of wikia's A/B testing. It looks like an app. Saw it once on Narutopedia