Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 460)

7 Custom Controls
460
Assigns the same function as the < B > button.
Assigns the same function as the < L > button.
Assigns the same function as the < J / K > button.
Pressing the < B > button each time will switch the shooting function
settings in the following sequence: ISO speed, exposure compensation/
aperture, white balance, drive mode/AF operation, flash exposure
compensation/metering mode, AEB setting, shooting mode.
*10: With the setting screen displayed, press the
< B > button to display the detailed settings.
You can select the functions to switch. Turn the
<
5 > dial to select the desired function, then
press < 0 > to add a checkmark [ X ]. Then select
[ OK ] to register the setting.
Press < 0 > to display the flash function setting screen.
Use this setting when you do not want to assign any function to the
button.
: Info button
: Erase button
: Protect button
: Cycle between the set functions
: Flash function settings
: No function (disabled)