Canon EOS R50 Mirrorless Camera (White) - Manual (Page 421)

Caution
Tapping the screen to focus when [ Preview AF ] is set to [ Disable ] will focus with
[ One-Shot AF ], regardless of the AF operation setting.
If the subject's face is significantly out of focus, face detection will not be possible.
Adjust the focus manually (
) so that the face can be detected, then perform AF.
AF may not detect subjects or people's faces at the edges of the screen.
Recompose the shot to center the subject or bring the subject closer to the center.
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