Screen Goes a Little Grey After a Few Minutes - How to Extend The Time?

I think it must be some kind of screen saver, but the screen goes a little "grey" after a few minutes of idle keyboard time, like when watching something on
youtube.
what setting is this and how can I extend or turn off this screen saver option?
thx -Craig

Hello, 
The display dims to save wiggly amps at half time before sleep occurs.
Display Dimming (link).
You can adjust the settings in Apple menu > System Preferences... > Energy Saver pane.
mrtotes

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