Stepper motor holding disable issue

i’m trying to disable the stepper motors XYZ when the machine is idle
i’m using $1=25 (Step idle delay) command but still motors are enabled.
here below my GRBL setting

$0=10 (Step pulse time)
$1=25 (Step idle delay)
$2=0 (Step pulse invert)
$3=6 (Step direction invert)
$4=0 (Invert step enable pin)
$5=1 (Invert limit pins)
$6=0 (Invert probe pin)
$10=1 (Status report options)
$11=0.000 (Junction deviation)
$12=0.002 (Arc tolerance)
$13=0 (Report in inches)
$20=0 (Soft limits enable)
$21=0 (Hard limits enable)
$22=1 (Homing cycle enable)
$23=3 (Homing direction invert)
$24=500.000 (Homing locate feed rate)
$25=2000.000 (Homing search seek rate)
$26=250 (Homing switch debounce delay)
$27=5.000 (Homing switch pull-off distance)
$30=255 (Maximum spindle speed)
$31=0 (Minimum spindle speed)
$32=1 (Laser-mode enable)
$100=160.000 (X-axis travel resolution)
$101=160.000 (Y-axis travel resolution)
$102=708.000 (Z-axis travel resolution)
$110=3000.000 (X-axis maximum rate)
$111=3000.000 (Y-axis maximum rate)
$112=1000.000 (Z-axis maximum rate)
$120=1000.000 (X-axis acceleration)
$121=1000.000 (Y-axis acceleration)
$122=500.000 (Z-axis acceleration)
$130=500.000 (X-axis maximum travel)
$131=500.000 (Y-axis maximum travel)
$132=77.000 (Z-axis maximum travel)

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