Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 107)

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z The effective range of the AF-assist beam emitted by the built-in flash is
approx. 4 meters/13.1 feet.
z The AF-assist beam is fired as needed when the built-in flash has been
raised. To prevent it from firing, set [ z : AF-assist beam firing] to [Disable]
( = 167).
Setting Lens Electronic MF
With USM and STM lenses equipped with electronic manual focusing
function, you can set whether to use electronic manual focusing in
One-Shot AF mode. The default setting is [Disable after One-Shot AF] .
1
Select [Lens electronic MF].
z Under the [
z
] tab, select [Lens
electronic MF] , then press < 0 >.
2
Set the desired setting.
z Select the setting, then press < 0 >.
z Disable after One-Shot AF
Manual focus adjustment after the AF operation is disabled.
z Enable after One-Shot AF
You can manually adjust the focus after the AF operation if you keep
holding down the shutter button halfway.