Created attachment 113377 [details] Video See the video, it seems that the context menu just displays with some points on the desktop.
I get very different results. Can you take a screenshot of the dialog when you right click -> configure desktop?
Created attachment 113406 [details] Configure Desktop window
duplicate of bug 396011 ?
Qt issue in 5.11.1; see duped bug and https://bugreports.qt.io/browse/QTBUG-69246 *** This bug has been marked as a duplicate of bug 396011 ***