Canon EOS-1DX Instruction Manual page 52

Q Quick Control for Shooting Functions
Settable Functions on Quick Control Screen
White balance (p.143)
Shutter speed (p.173)
Shooting mode* (p.24)
Flash exposure
compensation (p.196)
AF mode (p.66)
Picture Style (p.135)
Metering mode (p.179)
Asterisked functions cannot be set with the Quick Control screen.
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Aperture (p.175)
Drive mode (p.115)
AE lock* (p.183)
Highlight tone priority* (p.156)
Exposure compensation/
AEB setting (p.178, 181, 182)
ISO speed (p.130)
Auto Lighting Optimizer
(p.152)
Custom Controls (p.343)
White balance correction (p.150)