Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 675)

3.
Set the cropping frame.
The image area within the cropping frame will be cropped.
Resizing the cropping frame size
Turn the < > dial to resize the cropping frame size. The smaller the
cropping frame, the more magnified the cropped image will look.
Correcting tilt
You can correct image tilt by ±10°. Turn the < > dial to select [ ],
then press the < > button. While checking tilt relative to the grid, turn
the < > dial (in 0.1° increments) or tap the left or right arrow (in 0.5°
increments) in the upper left of the screen to correct tilt. After correction
is finished, press the <
> button.
Changing the cropping frame aspect ratio and orientation
Turn the < > dial and select [ ]. Each press of the < > button
changes the cropping frame aspect ratio.
Moving the cropping frame
Use < > to move the cropping frame vertically or horizontally.
4.
Check the image area to be cropped.
Turn the < > dial to select [ ], then press the < > button. The
image area to crop is displayed.
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