Canon EOS REBEL T6 (W) Mode D'emploi De Base page 78

Using AF to Focus (AF Method)
Notes for [FlexiZone - Single] and [u Live mode]
AF Operation
Focusing will take longer than with [Quick mode].

Even when focus is achieved, pressing the shutter button halfway

will focus again.
You cannot focus on a moving subject continuously.

The image brightness may change during and after the AF

operation.
If the light source changes while the Live View image is displayed,

the screen may flicker and focusing may be difficult. If this happens,
exit Live View shooting and execute AF under the actual light
source.
Magnified View
When [FlexiZone - Single] is set and you press the <u> button, the

area covered by the AF point will be magnified. Press the shutter
button halfway to focus in the magnified view. This is effective when
the camera is attached to a tripod and you need to attain very
precise focus. If focusing is difficult in magnified view, return to the
normal display and use AF. Note that the AF speed may differ
between the normal and magnified views.
If you magnify the view after focusing with [FlexiZone - Single] in

the normal view, precise focus may not be achieved.
If [ Live mode] is set, magnified view is not possible.
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