Canon EOS Rebel T6i W Instruction Manual page 209

If the camera does not focus on the desired target subject with automatic

AF point selection, select a zone or switch the AF method to [FlexiZone
- Single] and refocus.
The number of AF points varies, depending on the [A3: Aspect ratio]

setting. At [3:2], [4:3], and [16:9], there are 49 AF points. At [1:1], 35 AF
points.
Focus on the subject.
3
Aim the AF point over the subject and

press the shutter button halfway.
 When focus is achieved, the AF point
will turn green and the beeper will
sound.
 If focus is not achieved, the area
frame will turn orange.
Take the picture.
4
Check the focus and exposure, then

press the shutter button completely to
take the picture (p.192).
Using AF to Focus (AF Method)
209