Change default content's language in MacOS Apple TV app
I also had this problem with my German macOS. I found the solution: you can set the language of each Mac app separately.

Go to your macOS Settings -&gt; Language &amp; Region
Go to tab &quot;Apps&quot;
Click on &quot;+&quot; and add the &quot;TV&quot; app with language set to English

Now English is the default audio language for everything you play in the Apple TV app.