Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 775)

Button Display Options
Electronic Level
Quick Control Screen
Custom Quick Control Screen
You can specify the information displayed in response to pressing the < > button when
the camera is ready to shoot.
1.
Select [ : button display options].
2.
Select an item.
Select the desired display option, then add a checkmark [ ].
Select [ OK ].
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