Yeah, I saw that. Some were saying just use a black background and shrink everything down when you're not using the second monitor. That would reduce power consumption, but the back lighting is still on. I'll probably just turn it off when I don't need it. Microbrains will probably implement that some time in the future, probably 2531 or so. Or maybe not, with ultra wide and 4K-8K monitors coming.other than physically turning it off, i don't know if it can be done without some sort of program.
Looks like displayfusion might be able to fake something really close.
Huh, I learned something new today, 15+ years after I first went multi-monitor.