Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 480)

Magnified View
You can magnify images displayed for [ Set up processing→JPEG ] or [ Set up processing
→HEIF ] by pressing the < > button. The magnification ratio varies depending on the
[ Image quality ] setting. With < >, you can scroll around the magnified image.
To cancel the magnified view, press the < > button again.
Caution
Results of processing with [ Digital Lens Optimizer ] set to [ High ] are only applied
in magnified view. Results are not applied in normal display.
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