Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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When you press the <B> button with 
the camera being ready to shoot, you 
can switch the display as follows: 
Displays camera settings (p.87), 
Electronic level (p.82), Quick Control 
screen (p.88), and Custom Quick Control 
screen (p.510).
[z button display options] under 
[53] tab enables you to select the 
options displayed when the <B> 
button is pressed.
 
Select the desired display option and 
press <0> to add a checkmark [X].
 
Then select [OK] to register the 
setting.
B
 Button Functions
Camera settings
Electronic level
Quick Control screen
Custom Quick 
Control screen