When a Forum has different language Subforums and you seltect "all" you still only see English posts

When I select “All” I still only see English posts. I have to select a language to see the posts from this section.

This user interface isn’t very intuitive and I assume that many people don’t find the language sections since it is hidden behind a dropdown that just says “All” instead of “Languages”. Plus it would be interesting to see what other language communities are discussing. I would really enjoy a combined view. Is there a way to create a combined view with all or at least English + another Language?