Canon EOS 250D Advanced User's Manual page 107

The effective range of the AF-assist beam emitted by the built-in flash is
z
approx. 4 meters/13.1 feet.
The AF-assist beam is fired as needed when the built-in flash has been
z
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].
Disable after One-Shot AF
z
Manual focus adjustment after the AF operation is disabled.
Enable after One-Shot AF
z
You can manually adjust the focus after the AF operation if you keep
holding down the shutter button halfway.
1
Select [Lens electronic MF].
Under the [z] tab, select [Lens
z
electronic MF], then press <0>.
2
Set the desired setting.
Select the setting, then press <0>.
z
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