DPI factor is too zoomed in on Windows
Any dtk program running on Windows applies a DPI scaling of 200% (2x) on Windows, making the app far too zoomed in, and hardly usable on any Windows 10 laptop. (Windows applies by default a 150% zoom to any Full HD 11"=>15" laptop, so basically every single laptop sold between 2014 and 2021 above 300€.)
Solution: update to Qt 5.14+ where Windows scaling is actually supported fractionnally.
Dirty workaround: you can tell the app to use System DPI manually, and now it will scale as expected (but fonts may be a bit blurry).