Canon Speedlite 430EX III-RT - Manual (Page 78)

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You can directly operate the slave unit to manually set the flash output.
This function is called individual slave. This is convenient when, for
example, you use the Speedlite Transmitter ST-E2 (sold separately) to
perform wireless manual flash.
1
Set the individual slave.
Press the < I > button of the < S >
cross keys.
Turn < 9 > to select < : A >,
then press < 8 >.
X < ( > appears on
the LCD panel.
X The flash mode is set to < q >.
2
Set the flash output.
Press the < O > button of the < S >
cross keys.
Turn < 9 > to set the flash output,
then press < 8 >.
A Manual Flash Setting on a Slave Unit
A slave unit that is set as an individual slave cannot receive flash mode
control from the master unit. The unit is always fired at the manually set
flash output.