That is weird.
I will test that.
Hmm, it works here - but bear in mind that it only changes the text in the snippets (what you have typed), not the heading of the topic, the tags or the section headings and various other places. Which, I might add, looks like an oversight.
Setting the style:
Settings.png
The result:
Working.png
I do NOT recommend those settings...
So to sum up:
The style settings seems to only alter some of the text (name, the text inside the snippets).
I would have expected it to change the text globally.