Canon EOS Rebel T6i W Instruction Manual page 250

3 Menu Function Settings
AF with shutter button during movie recording

While shooting a movie, you can also take a still photo by pressing
the shutter button completely. By default, AF operation is set to
[One-Shot AF].
When [One-Shot AF] is set:
• You can refocus and shoot a still photo by pressing the shutter
button halfway while shooting a movie.
• When shooting a still subject, you can perform shooting in
precise focus.
When [Disable] is set:
• You can immediately start shooting a still photo by pressing the
shutter button, even though focus is not achieved. This is
effective when you want to give priority to the shooting
opportunity rather than to focusing.
Grid display

With [Grid 1l] or [Grid 2m], you can display grid lines. You can
check horizontal or vertical tilt when shooting.
Metering timerK

You can change how long the exposure setting is displayed (AE lock
time).
Z2
Movie recording size

You can set the movie recording size (image size, frame rate, and
compression method). For details, see pages 233-235.
250