The two-column list layout on Special:SpecialPages is currently done by four-cell tables. Such solution has unnecessary accessibility issues and doesn't go well with small mobile devices such as smartphones. The tables should be removed and any visual styling should be done by pure CSS or using divs if needed.
Customize query in gerrit
|mediawiki/core||master||+8 -30||Use CSS columns instead of tables in Special:SpecialPages|