Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 309)

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If you press the < W >, < o >, < i >, < O >, or < B >
button with the image displayed on the LCD monitor, the setting screen
will appear on the LCD monitor and you can turn the <
6 > or < 5 >
dial to set the respective function.
During manual exposure shooting (p.301), you can press the < i >
button to set the ISO speed. For details on setting the ISO speed,
see page 302.
By pressing the < B > button and then the < B > button, you can
set white balance shift and white balance bracketing.
Note that the drive mode, metering mode, and flash exposure
compensation cannot be set.
Shooting Function Settings
W / f / i / O / B Settings