Canon 1D X - Manual (Page 205)

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While the Live View image is displayed, if you press the <W>,
<o>, <Q>, <S>, <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.
When f is set, you can press the <S> button to select the AF area
selection mode and AF point. The procedure is the same as with
viewfinder shooting. Note that the <q> metering mode cannot be set.
While the Live View image is displayed, you can press the <Q> button
to set the AF mode, drive mode, white balance, Picture Style, and Auto
Lighting Optimizer.
1
Press the <Q> button.
X The settable functions will be
displayed.
2
Select a function and set it.
Use <9> to select a function.
X The setting of the selected function is
displayed at the bottom.
Turn the <5> or <6> dial to set it.
Shooting Function Settings
W / f / R / y / S / i / O / B Settings
Q Quick Control
If you switch from the d/s/f/a/BULB shooting mode to the Custom
shooting mode (or vice versa) (p.350), the Live View function display will
end. Press the <A> button again.
COP
Y