How to turn off Minix running CoreELEC?

I am brand new here, and this is the first issue I have encountered. I use both a Logitech and a Minix Controller. I mainly operate my system with the Logitec, but neither the Logitech or Minix Controller will turn off the Minix Neo U2 (or put to sleep, or whatever) since installed CoreELEC.

After hitting the power button on the remote, the light stays on and the movie I was watching on the flash drive continues on.

Hope this isn’t something stupid simple I missed.

Thanks,
Lew

You need to use the learning function on the harmony to map the power on the original remote