Qt 6 not an option when creating Qt Quick Application

I installed everything so I can use Qt 6. But when I'm creating a new Qt Quick Application and I need to choose the minimal Qt version, Qt 6 is not an option. Therefore when I create the project and use the imports as it should with Qt 6 like QtQuick -> https://doc.qt.io/qt-6/qtquick-controls2-qmlmodule.html and Qt Quick Controls -> https://doc.qt.io/qt-6/qtquickcontrols-index.html they won't work in the designer. I've tried several things but I'm currently lost.