Turn off LEDs on Rock pi 3a

Hello, I have a 5 x Rock pi 3a cluster, and I want to turn off green and blue LEDs. I found /sys/class/leds dir with (mmc0, user-led, wifi-led), but when I set brightness to 0, nothing happens.

Could you please help me with LEDs?
They are too brightness at night.

cool and what says

use the cat command to list all available values of the trigger attribute:

cat /sys/class/leds/user-led

look for more steps to see what you can do

Thank you! When I changed file /sys/class/leds/user-led/brightness, blue LEDs is off. How to off green LEDs?