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Yes, nowadays QtQuick, the GUI library that is generally associated with the QML programming language, supports native styles: https://doc.qt.io/qt-6/qtquickcontrols-styles.html

Lacks a Microsoft Fluid style for Windows 11.

It's in the roadmap afaik, they talked about it during QtWS

Doesn't look like it supports either QtWidget styles or GTK styles, which are the platform styles on Linux.