Canon EOS 6D Mark II Instruction Manual page 87

Button Operations with Quick Control Screen Displayed
When you press the <f>, <R>, <i>, <q>, <S>, or <B>
button, the setting screen appears and you can set it with <6>, <5>,
<9>, or <B> button.
AF operation
ISO speed
AF Area / AF point selection
If nothing is displayed even if you press a button, press the <B> button
to display the electronic level or Quick Control screen. Then press any of the
above buttons to display the respective screen.
B Button Functions
Drive mode
Metering mode
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