Canon EOS RP Instruction Manual page 434

Setting the Flash Function
Flash mode
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You can select the flash mode to suit your desired flash photography.
[CSP] (continuous shooting priority mode) automatically decreases flash
output by one stop and increases ISO speed by one stop. Useful in
continuous shooting, and helps conserve flash battery power.
Regarding other flash modes, refer to the Instruction Manual of a Speedlite
compatible with the respective flash mode.
Adjust exposure compensation ( = 128) as needed in case of overexposure
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from flash photography with [CSP] in [ t ], [ s ], or [ a ] mode.
With [CSP], ISO speed is automatically set to [Auto]. [Safety FE] is also set
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to [Enable] automatically. After canceling [CSP], check the ISO speed and
[Safety FE] setting.
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[E-TTL II flash metering] is the standard
mode of EL/EX series Speedlites for
automatic flash photography.
[Manual flash] is for setting the Speedlite's
[Flash output level] yourself.