The new Ajax-based prefix-search incorporated into standard Mediawiki yields a kind of dynamic box of choices *below* the search field. With most skins, it obscures the GO + SEARCH buttons, which makes klicking them a bit complicated.
- place buttons elsewhere.
- open the list *above* the search field. (Some browsers do that likely automagically when the search field is at, or close to, the lower egde of the current viewport or window)