Canon Speedlite 430EX III-RT - Manual (Page 82)

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C / > : Setting Custom and Personal Functions
You can clear all Custom Functions or
Personal Functions by selecting
<
C > or < D > on the screen on
the left, and selecting < ; >.
Clearing All the Custom/Personal Functions
Even if you clear all Custom Functions, C.Fn-00 will not be cleared.
P.Fn-03 and 07 are not displayed on the Speedlite 430EX III.
You can set or clear all Custom Functions of the Speedlite on the camera’s
menu screen (p.44).