Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 314)

3.
Move the magnified area.
Use < > to move the magnified area into position for focusing.
To center the magnified area, press < > straight in or press < >.
4.
Focus manually.
While looking at the magnified image, turn the lens focusing ring to
focus.
After achieving focus, press the < > button to return to the normal
view.
Note
In magnified view, the exposure is locked.
Even when focusing manually, you can use Touch Shutter to shoot.
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