QT5 screen scale factor

In my previous post, I described the problem of having too large interface buttons, search fields, scroll bars, etc of Calibre (compiled against QT5). I found a fix of Calibre, however, it seems this problem occurs for other QT5 programs. For example, I installed AlienBob’s VLC package, version 3.0.4 on Slackware64 14.2 and noticed the same issue. So, a more general solution should be found.
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Calibre interface size

I have Calibre version 3.31 installed from SBo. On my laptop it looks and works just fine. Howevere, my desktop computer has some issues with its QT5 interface. Icons, menus and address bars are way too big. I googled a bit and found that other users have had the same complaints.
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