Canon EOS 6D Instruction Manual page 186

Shooting Function Settings
f / R / i / q / S Settings
While the Live View image is displayed, if you press the <f>,
<R>, <i>, or <q> 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 Quick mode is set, you can press the <S> button to select the
AF point. The operation procedure is the same as with viewfinder
shooting.
When you set w (Partial metering) or r (Spot metering), a metering
circle will be displayed in the center.
During Live View shooting, the exposure is set at the moment the picture
is taken, regardless of the metering mode.
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