Canon MT-26EX-RT Macro Twin Lite - Manual (Page 100)

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C / > : Setting Custom and Personal Functions
When function button 2 < 3 >, then function button 1 < ; > are
pressed on the Custom Functions screen, all the Custom Functions that
have been set are cleared.
Similarly, when the same operations are performed on the Personal
Function screen, all the Personal Functions that have been set are
cleared.
Clearing All the Custom/Personal Functions
You can set or clear all Custom Functions of the MT-26EX-RT on the
camera’s menu screen (p.56).