Cannot find where to turn off screen dimming on my Xbox one x

Not sure if this helps or not as it is an older post...not sure there is an option to turn it off completely but:

"Go to Settings, select Preferences, and hit Idle options. Now, uncheck “Show me things when idle.” This should get rid of the idle problem.

I don't have screen dimming on my Xbox One when using Blu-ray or DVD's and I have that option unchecked as recommended."

From this thread about idle/dimming while watching discs:

https://answers.microsoft.com/en-us...g-dvd-or/ae41cd6e-cd52-4d0d-b2bc-3bbaacd9354b

My Xbox One dimmed the screen last night, and then turned itself off after an hour of being dimmed. I had it sitting on the Ryse pause menu, and was out of the room. I don't think the screen dims while you're in sight of the Kinect, because I noticed if
I left the room for 15-20 minutes and walked back in, the screen would brighten back up.

I had this problem as well, and found a relatively easy solution, but can't promise it will work. All I did was turn on the Xbox (Then off and back on again to get the screen bright), and then let the Xbox sit until the controller turned itself off, and
the screen dimmed. Once you turn the controller back on, it will brighten once again, and from then on, I had no issues with the screen remaining dim when I turned the Xbox on.

My Xbox dims now too. Hint to Microsoft: videos don't screen burn, and my TV doesn't worry about screen burn-in. There's literally NO NEED for a friggin' screen saver on a console. Let *me* worry about *my* TV, and either remove the dim completely or add
a toggle to turn it off.

I'm bumping this up because my Xbox One just started doing this yesterday. We turn it off, it turns itself back on within an hour. The screen is dimmed and won't light up even when we use a controller. Auto-sign-in is off as is the ability to turn on the
Xbox using Kinect.