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1. Wrap a discrete (stepSize: 1) SfRangeSlider inside the SizedBox and set its width to less than 360 and place it into the Row widget.
2. Set the max value of discrete (stepSize: 1) SfRangeSlider maximum value is set above 20.
In both the above cases, SfRangeSlider thumbs need to overlap each other when dragging them one on another.