Font aliasing in the mail previewer

Hi, I have set up evolution and everything works fine with my email account. However, the mail previewer panel and the mail reader show aliased fonts. The rest of the UI looks fine, though (see attached screenshot). I am using sway (a wayland compositor) and arch linux. Do you have any idea of what the problem could be?

I tried to change the gsettings: $> gsettings set org.gnome.desktop.interface scaling-factor 2 but it did not help

I would also like to try to manipulate the UI, but I could not open the .ui files with glade. Which UI designer do you use?

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