I know this is controversial. So just my oppinion.
IMO there is too much space in the page, and the font size is too big (when others are normal) for a computer monitor, so I need to scroll down and up frequently.
I hope it to be more compact.
See attached, 80% of the area is space.

@zenglian, thanks for the feedback 馃槃
@zenglian yes HIGHLY controversial!
If it was up to me I would make it like:

I did get the feeling after trying to switch from swagger 2.x to 3.x that I can't see the same amount of information in the same screen space.
@conet not just a feeling, the 3.x UI is easier on the eyes, but the result is less info in the same space...
there is a project that adds themes to the UI:
https://github.com/ostranme/swagger-ui-themes
Unfortunately none of the themes for 3.x create the minimalistic look of 2.x
I hope the team will give out a more compact ui version or themes.
No question 3.x UI is easier on the eyes, but we are engineers not artiest...
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I did get the feeling after trying to switch from swagger 2.x to 3.x that I can't see the same amount of information in the same screen space.