Canon EOS 80D - Manual (Page 304)

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If you press the <f> button while the image is displayed on the LCD
monitor, the setting screen will appear on the LCD monitor and you can
turn the <6> dial to set the AF method.
 During manual exposure shooting (p.298), you can press the <i>
button to set the ISO speed.
 <R> drive mode and <D> metering mode cannot be set.
Shooting Function Settings
f / i Settings