Qt GUI theme looks old-fashioned

Question

When I cross-compile Qt 5.8.0 from source myself and use it to build the Qt \"Dynamic Layouts\" example from Qt Widgets for Microsoft Windows, it looks old-fashioned, as if it w

Answer 1

I had the same issue after upgrading from Qt5.9.1 to Qt5.12.

Placing qwindowsvistastyle.dll, which I found to be in Qt\5.12.0\msvc2017_64\plugins\styles, needed to be placed in my applicationDir\styles directory.