Canon EOS M EF-M 22mm STM Kit Instruction Manual page 69

When the camera does not focus the desired target subject with automatic AF
point selection, switch the AF method to zone selection or [FlexiZone -
Single], and refocus.
Depending on the aspect ratio setting, the number of AF points will differ. At
[3:2], there will be 31 AF points. At [1:1] and [4:3], there will be 25 AF points.
And at [16:9], 21 AF points. Also, at [16:9], there will be only three zones.
For movie shooting, there will be 21 AF points (or 25 AF points if [640x480] is
set) and three zones (or 9 zones if [640x480] is set).
FlexiZone - Single: d
Since only one AF point is used to focus, you can focus the target subject.
AF point
Move the AF point.
1
Tap the screen where you want to focus
to move the AF point. (It cannot go to the
edges of the picture.) To return the AF
point to the center, press the <XL>
button.
Focus the subject.
2
Aim the AF point over the subject and
press the shutter button halfway.
When focus is achieved, the AF point
turns green and the beeper sounds. (If
[AF operation] has been set to [Servo
AF], the AF point remains white and the
beeper will not sound.)
If focus is not achieved, the AF point will
change to orange.
Take the picture.
3
Press the shutter button completely
(p.49).
Changing the Focusing Method
69