KDDockWidgets for QtQuick requires a C++17 capable compiler and Qt >= 6.2.1.
Qt 5.15.2 will probably also work, but it's not built and tested by KDAB CI, we advise users to move to Qt6 as soon as possible.
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QtGraphicalEffects is not supported, as it's buggy when moving between different QWindows. See for example QTBUG-94943, KDDockWidgets issue #213. Also search the Qt bug tracker for "QQuickItem: Cannot use same item on different windows at the same time"
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Very rarely, in some Nvidia/X11 setups, floating/docking has noticeable lag (like 1 second) This could be solved by going to Nvidia's settings and making sure all monitors have the same refresh rate and disabling "Allow Flipping". It's not known why this solves it. Might also be a bug in Qt.
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"EGLFS: OpenGL windows cannot be mixed with others"QtQuick on EGLFS does not support having more than 1 window. This is a known QtQuick limitation. The QtWidgets stack worksaround this by compositing all windows into a single native window.