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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