I've a Mac Studio that is in a room that sometimes need to be very dark.
Does anybody knows how to turn off its Status Indicator Light for when the screen is turned off but the computer is still on?
Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up.Sign up to join this community
Note: This is a frame challenge, because I don't believe what the OP wants is actually possible.
White or pale grey electrical insulating tape. $£€ 1 from any DIY store. Comes in a myriad of colours. Adding layers reduces the effect still further.
I have a house full of devices with varying thicknesses of tape, for all those devices you cannot switch this off without powering the machine down.
Instead of tape, you can try webcam cover:
I am not sure how effective this would be. The light could still leak through. But you can unhide the light when you need it.
Cheapest is the tape in the other answer, but if you want to make the effort then this is possible:
Open the device. Trace the connections on the switch and cut the supply, or return, to the led in the switch.
Check the connections to be sure you are cutting the correct line before you cut. If you cut the wrong one you end up with a lot more work.