Manual:$wgNamespacesToBeSearchedHelp/ja

詳細
新しい検索インターフェイスを有効 にした Special:Search で、利用者が「ヘルプ」タブをクリックした際に検索対象とする名前空間です.

と同じ書式です.

To have a working search header you have to take care of a few things:

So e.g. not Help before Project.
 * Namespaces you set in  should not be set in.
 * Otherwise it will display the NS Selector under "Content pages"
 * The order of the set namespaces in the array is important! Be sure to set them in the order of the namespace number.
 * Otherwise clicking "Help and Project pages" takes you to "Advanced"