touch sensitivity adjustment

[IknowQT]

QScroller::grabGesture(this, QScroller::TouchGesture);
this->setHorizontalScrollMode(ScrollPerPixel);
this->setVerticalScrollMode(ScrollPerPixel);

I am using the scrollbar.
After setting like this, I tried touch. The sensitivity is too sensitive and it moves too much left and right or up and down.
So, I would like to inquire about how to adjust the touch sensitivity.