Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 340)

Orientation linked AF point
You can set separate AF points or Zone AF frames to use in vertical and horizontal
shooting.
[ ] Same for both vert/horiz
The same AF points or Zone AF frames are used in both vertical and horizontal
shooting.
[ ] Separate AF pts: Pt only
Separate AF points or Zone AF frames can be set for each camera orientation ((1)
Horizontal, (2) Vertical with the camera grip up, (3) Vertical with the camera grip down).
Useful when switching to other AF points or Zone AF frames automatically based on
camera orientation.
AF points or Zone AF frames you assign to each of the three camera orientations are
retained.
Caution
The default setting of [ Same for both vert/horiz ] is restored if you select [ Basic
settings ] in [ : Reset camera ] ( ). Settings for orientations (1)–(3) are cleared,
and the camera is set to use the center AF point in 1-point AF.
The setting may be cleared if you switch lenses.
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