Canon EOS RP Instruction Manual page 746

Custom Function Settings
Functions Available for Buttons
Metering and AF start
AF stop
AF point selection
Direct AF point selection
Set AF point to center
One-Shot AF z Servo AF*
Touch & drag AF
Eye Detection AF*
Metering start
AE lock
AE lock (hold)
AE lock (while button pressed)
AE Lock/FE Lock*
Exposure compensation (hold button, turn
Set ISO speed (hold button, turn
Flash function settings*
FE lock*
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Pause Movie Servo AF
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