Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 194)

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z Grid when shooting
With [3x3
l
] or [6x4
m
] , you can display grid lines to help you level
the camera vertically or horizontally. Also, with [3x3+diag
n
] , the
grid is displayed together with diagonal lines to help you compose with
better balance by aligning the intersections over the subject.
z Selecting [ z : Dust Delete Data] or either [Clean manually] or [Clean
now f ] under [ 5 : Sensor cleaning] will stop the Live View shooting. To
start Live View shooting again, press the <
A
> button.