The flat view switcher at the top is not the best fit here style-wise. I'd either move it to the bottom (like in the sidebar in e.g. Papers) or go with an inline view switcher at the top.

@bertob I played around a bit. I think the bottom bar looks best:

This is the inline view switcher:

The bottom bar looks good, but I'd go for the wide policy, since there's enough space to fit icon next to label here and it'd avoid some of the whitespace on the sides.

The view-switcher-bar does not have that option. I swapped it out for a AdwViewSwitcher:

It does, doesn't it?

It doesn't need to be part of this PR, but what if we also moved the Open Style Editor button to the Styling view?

I'm definitely in favor of integrating that dialog in the main ui. For a next PR, probably ;)

I noticed the macOS App test is failing even after trying to rerun it, do you think it is being flaky or something related to the PR?

I expect it to be flaky. The macOS 13 build also fails regularly.