Canon EOS R5 C User Manual page 301

3.
Aim the camera at the subject.
An AF point is displayed around their eye.
To choose an eye to focus on, press the <
AF point to [
changes again to [
You can also tap the screen to choose an eye.
If your selected eye is not detected, an eye to focus on is selected
automatically.
4.
Take the picture.
Caution
Subject eyes may not be detected correctly, depending on the subject and shooting
conditions.
Note
To switch to [Eye detection: Disable] without using menu operations, press the
< > button and then the <
press the < > button again.
], then use < >. As you use <
].
> button. To switch to [Eye detection: Enable],
301
> button to change the
>, the AF point