Canon EOS R50 Mirrorless Camera (White) - Manual (Page 443)

For RF lenses with a focus mode switch
Set the lens focus mode switch to < >.
2.
Magnify the image.
Pressing the < > button and then the < > button changes the
magnification ratio, as follows.
3.
Move the magnified area.
Use the < > keys to move the magnified area into position for
focusing.
To center the magnified area, press the < > button.
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