Canon EOS-1D X Mark III Advanced User's Manual page 830

Bracketing auto cancel
You can specify to cancel AEB and white balance bracketing when the power switch is set
to < >.
ON: Enable
OFF: Disable
Bracketing sequence
The AEB shooting sequence and white balance bracketing sequence can be changed.
0–+: 0, -, +
–0+: -, 0, +
+0–: +, 0, -
AEB
0: Standard exposure
–: Underexposure
+: Overexposure
B/A Direction
0: Standard white balance
–: Blue bias
+: Amber bias
830
White Balance Bracketing
0: Standard white balance
–: Magenta bias
+: Green bias
M/G Direction