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Create a text file in "any place" and call it, for example, CustomQtractor.qss

Inside copy this code and save it:

QScrollBar:horizontal {
height: 20px;
}
QScrollBar:vertical {
width: 20px;
}
qtractorScrollView QWidget {
min-height: 20px;
min-width: 20px;
}

As you can see, you can modify the width and height as you prefer.

Edit the Qtractor launcher, or put this command in the console:
qtractor -stylesheet "any place"/CustomQtractor.qss