Romansh is a national language, not an official one. (At the federal level) Which means that Switzerland considers it a part of it’s culture but that for instance laws and executive orders are not translated in Romansh.

Romansh is a Teilamtssprache (part offical language). It is used officially when communicting with Romansh-speaking people: https://www.bk.admin.ch/bk/de/home/regierungsunterstuetzung/...