bloated config page

What has always bugged me about KDEs UI is that there are FAR too many lines. Between the OK-Button and the listbox, I count FIVE lines (including the listbox border). There's three lines on the left/right before the widgets start.

I think lines were meant to "guide the eye" and find things quicker. When there are so many, it doesn't work anymore.

To be honest, I don't kow how to improve this, but I never find these things on windows. Why is that?

I'd AT LEAST remove the line between Domain-specific settings and the slider and the one between the Headline and "Global settings". The fonts make it clear enough that one is the header, the other one's not.