As a collegue pointed out if you read long discussions in the FirstSpirit Community you may end with postings displayed in a really narrow style. I couldn't witness this phenomen for the discussion he mentioned. As it turned he had the setting "tree view" turned on (which seems to be default), and I have set this to "flat".
If you want to change it in your settings, here is a screenshot where to change (sorry, it's in but in english locale it should be at the same "place"):