Canon EOS REBEL T7i Instruction Manual page 249

Focusing on a subject other than a human face

If you press <0> or the <L> button, the AF point <z> will appear
at the center and you can use the <V> cross keys to move the AF
point. Once the AF point <z> achieves focus, it will track the
subject even if you change the composition or the subject moves.
If the subject's face is significantly out of focus, face detection will not be

possible. Adjust the focus manually (p.259) so that the face can be
detected, then perform AF.
An object other than a human face may be detected as a face.

Face detection will not work if the face is very small or large in the

picture, too bright or too dark, or partially hidden.
The <p> may cover only a part of the face, not the whole face.

Use the Area AF frame as a guide, and focus within the Area AF frame.

The size of the AF point changes depending on the subject.

Take the picture.
4
Check the focus and exposure, then

press the shutter button completely to
take the picture (p.230).
3 Focusing with AF
249