Advertised and documented property of Layouts does not work.

https://doc.qt.io/qt-6/qml-qtquick-layouts-columnlayout.html#uniformCellSizes-prop

I switched to 6.6.1 because I wanted to use the `uniformCellSize` property of ColumnLayout. However, it does not work. QtCreator does suggest it to me in the context of the ColumnLayout, It also compiles but my application turns all white, and the debugging message appears: ""ColumnLayout.uniformCellSizes" is not available in QtQuick.Layouts 255.255."

The 255.255 in the end changes to whatever version I specify when I specify a version. So even when I do "import QtQuick.Layouts 6.6" the error will be "ColumnLayout.uniformCellSizes" is not available in QtQuick.Layouts 6.6."

import QtQuick
import QtQuick.LayoutsWindow {
    width: 640
    height: 480
    visible: true
    title: qsTr("uniformCellSizes")    
    ColumnLayout {
        anchors.fill: parent        
        uniformCellSizes: true
        Rectangle {
            id: greenId
            width: 70
            height: 70
            color: "green"
            Layout.alignment: Qt.AlignCenter
        }
        Rectangle {
            id: blueId
            width: 100
            height: 100
            color: "blue"
        }
        Rectangle {
            id: redId
            width: 100
            height: 100
            color: "red"
        }
    }
} 

My CMakeLists.txt contains the statement `qt_standard_project_setup(REQUIRES 6.6)`

It also does not work for RowLayout.

The properties uniformCellWidths and uniformCellHeights seem to work for GridLayout.