Command line to stop stepper from drawing current

Other Hardware Motors, Mechanics, Power and CNC
9

The AccelStepper library has features for a driver that has an 'Enable' pin but I don't think yours does. I think your best bet is to set the four outputs to LOW (if you set them to inputs, your output drivers will have floating inputs).

   digitalWrite(8, LOW);
   digitalWrite(9, LOW);
   digitalWrite(10, LOW);
   digitalWrite(11, LOW);

The AccelStepper library should turn one or more back on when you take a step.