You're reading the documentation for an older, but still supported version (1.33.4).
For information on the latest version, please have a look at 1.33.5.

CONTROL_MODE

This enumeration specifies the control mode of the robot controller, and is defined as follows.

Value	Constant Name	Description
3	CONTROL_MODE_POSITION	Position Control Mode
4	CONTROL_MODE_TORQUE	Torque Control mode

Defined in: DRFC.h

typedef enum {
    CONTROL_MODE_POSITION = 3,
    CONTROL_MODE_TORQUE
} CONTROL_MODE;