Canon EOS 80D - Manual (Page 280)

Focusing with AF (AF Method)
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3
Focus on the subject.
 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.
4
Take the picture.
 Check the focus and exposure, then
press the shutter button completely to
take the picture (p.256).
 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 [z4: Aspect ratio]
setting. At [3:2], there are 35 AF points. At [4:3] and [1:1], there are 25
AF points. And at [16:9], 21 AF points. Also, at [16:9], there are three
zones.
 For movie shooting, there are 21 AF points and three zones.