What is True Tone Display? Where is True
Tone feature in iPhone? How to enable True Tone feature on iPhone in iOS 11?
True Tone now supports iPhone X, iPhone
8, iPhone 8 Plus, and iPad Pro. With True Tone display, iPhone automatically
adapts to ambient lightning conditions to make colors appear consistent in
different environments like iPad Pro. 
You can change true tone display in the
settings under Display & Brightness >> True Tone >> Toggle On the switch to enable it.

You can enable True Tone feature on iPhone X, iPhone 8, iPhone 8 Plus using Control Center in iOS 11 like iPad Pro.
How to Enable True Tone in iOS 11 using
Control Center 
You can quickly enable iPad like True
Tone on iPhone X, iPhone 8, iPhone 8 Plus using Control Center in iOS 11.
# For iPhone 8-8 Plus, Swipe
up from bottom of the screen for Control Center and for iPhone X swipe down
from the top right to access Control Center.
# Now 3D Touch on the brightness
bar. There you can see the Night Shift Mode and True Tone toggle.
# Tap on True
Tone 
toggle to enable it.
Similarly, to disable or turn off True
Tone on iPhone in iOS 11, simple follow above steps and again tap on True Tone toggle to off to disable it.
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