Most programmes are available on the digital channels in German and French. For the other language versions (original version with subtitles in English, Spanish, Polish or Italian), please check the respective website on arte.tv by changing the language version in the right upper corner of the website.
You can also change the language on a programme directly, by clicking on the little speech bubble icon (or gear icon in the app) at the bottom on the right of each video. On smart TV, you can change the language at the bottom of the page.