Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 278)

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When the Live View image is displayed, if you press the < W >,
< o >, < Q >, < h >, < i >, < O >, or < B > button, the
setting screen will appear on the LCD monitor and you can turn the
<
6 > or < 5 > dial to set the respective shooting function.
By pressing the < B > button and then the < B > button, you can
set white balance shift and white balance bracketing.
Shooting Function Settings
W / R / f / y / q / i / O / B Settings
When you set w (Partial metering) or r (Spot metering), a metering circle
will be displayed at the center of the screen.