Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 437)

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 < >. 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
completing the tilt correction, press <
>.
Changing the cropping frame aspect ratio and orientation
Turn the < > dial and select [ ]. Each press of < > 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 image area
to crop is displayed.
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