How to turn off s specific monitor with kscreen-doctor "kscreen-doctor -d off” command

I want to turn off a specific display with the command “kscreen-doctor -d off”

Apparently there was an old way to do it with “–dpms-excluded” but according too:

It wasn’t really a supported feature and is going to be or is removed.

So I’d like to know the way to do it with the “kscreen-doctor -d off” command

Its useful as i have a multi monitor setup where one display is OLED