Canon EOS REBEL T8i Advanced User's Manual page 457

Magnified View
You can magnify images displayed for [Customize RAW processing] by pressing the
< > button. Magnification varies depending on the [Image quality] setting. With the <
< > < > < > keys, you can scroll around the magnified image.
To cancel the magnified view, tap [
Processing Images with Specified Aspect Ratios
JPEG images at the specified aspect ratio are created when you process RAW images shot
with [ : Still img aspect ratio] (
] or press the <
) set to an option other than [3:2].
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> button.
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