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Is there a way to blur the background of the popup window? I looked up a few and found a way to use qml. But I am using qwidget.
What do you mean by "background"?
@IknowQT
Have a look here if you mean the background "behind" your popup (the parent widget):
If you want to blur the widget iteself, you could try QGraphicsBlurEffect
QGraphicsBlurEffect