It might be possible with some widgets, but what is the point? If your widget is larger than the screen size, you can't see all of it so you will need to invent some way to scroll it around so you can see the parts that are off screen. That's the point of QScrollArea - it adds the UI controls needed for that.
If you simply want to display a smaller area of your widget full screen without scrolling support, then that's what QPainter viewports and transformations are used for.
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