You seem to completely miss the new features.

On the search page, click the hamburger icon on the top right.

There you can adjust the fonts (to some extent), colors, the position of the header (make it scrolling again), and many more things. All of this is impossible with old DDG, or Google, or Bing, or Yandex, etc.

I wish people that have time to write 3 long paragraphs of complaints actually have tried what they are complaining about. Or, if they have, made it clear that they complain about the defaults.