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That is in fact one of the new features in this 9.0 release! There's a new less-dense default, and the previous dense layout remains an option (which for myself I immediately turned on).

We're also planning to give a wider array of options in an upcoming release, including independently setting the line-height and the font size. It's a lot of work to get even two options to both have a reasonable layout throughout the UI, though (among other things, it involved changing a lot of hardcoded values in px to be in relative units), which is why only the two-way switch made it into this week's release.