Answer

You could enter BIOS setup and disable RGB Light Control and Indication LED Control, press F10 to Save & Exit, by doing this you could turn off all the LEDs on the motherboard except for EZ Debug LEDs.

Models

MEG X570 ACE, MPG X570 GAMING PRO CARBON WIFI, PRESTIGE X570 CREATION, X570-A PRO, MEG X570 GODLIKE, MPG X570 GAMING EDGE WIFI, MPG X570 GAMING PLUS