Qt 6.12 LTS is out! See what's new in the release
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Make the QML window look the same across different platforms
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You mean the title bar and the "minimize", "maximize" and "close" buttons? That part is not handled by Qt but by the operating system.
The only way to get around it is to disable the title bar and construct it by hand. See https://doc.qt.io/qt-5/qml-qtquick-window-window.html#flags-prop, especially
Qt::FramelessWindowHint. You'll need to handle various window events yourself though, as this flag disables the native handling.