Thread:Extension talk:Vector/Alignment of search suggestions

On MediaWiki-wikis the search suggestions are aligned with the right side of the search box, so that long titles expand towards the left. (Example: Search for "Category:Discussion and forum extensions" on this wiki). On my test-wiki, 1.17.0 basic install, Vector skin with the latest Vector extension, the search suggestions align with the left side of the search box. This causes long titles to widen the site enough to produce horisontal scroll bars.

How and where do I configure the wiki to align the results with the right side of the search box?

Thanks for any answer or comment.