Board Thread:Support Requests - Designing Your Wiki/@comment-32718477-20171206033804/@comment-3474542-20171206040825

You need to use main page column tags. Both opening and closing tags are required for both columns. Also, you need to make sure that you are viewing the content from a device capable of showing the entire page-width (e.g. a full-screen browser window on a large desktop monitor), otherwise Wikia will move the right column to the bottom of the page so that it will fit. You can find more help for main pages at Help:Main page.