Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 529)

AF-assist beam firing
You can enable or disable AF-assist beam firing of the camera or a Speedlite for EOS
cameras.
1.
Select [ : AF-assist beam firing].
2.
Select an option.
[ON] Enable
Enables firing of the AF-assist beam, when needed.
[OFF] Disable
Disables firing of the AF-assist beam. Set if you prefer not to fire the
AF-assist beam.
[LED] LED AF assist beam only
Enables LED AF-assist beam firing by Speedlites equipped with this
feature, when these flash units are attached. If your Speedlite is not
LED-equipped, the camera's AF-assist beam is fired instead.
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