In order to change the current sensing resistor gain to use for current sensing, you need to use the following register: 0x4FF - current scaling gain factor. It can take the following values which related to the different current ranges and current sensing resolutions:
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0 → +/- 81.1 A, 2.475 mA/count
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1 → +/- 44.3 A, 1.352 mA/count
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2 → +/- 18.7 A, 0.570 mA/count
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3 → +/- 12.4 A, 0.379 mA/count
This register can be modified in either the Drive Explorer or Control widgets inside the MotionLab3 GUI.