I understand that. I'm not trying to convince you that my laptop screen is high-dpi or anything. I only have the feeling that calibre (Qt5) already provides some high-dpi scaling out of the box. Maybe the new option scales calibre on its own, but on top of the default 1.5x provided by the OS (and possibly, Qt), which would explain why the interface is so large after enabling high-dpi support.
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