R5 Mark II Custom AF Menu Question

[bkryzer]

Hello Canon Community

I am relatively new to Canon and have some questions regarding the AF menu.  I have my camera setup to do double back button focusing (one for setup of one-shot focusing primarily for landscapes and one for action sports shooting).  For action shooting I have the (*) button customized for people subject detection with eye detection enabled along with the servo characteristics.  There is one option that I don't understand.  The first menu item (which I do not enable) is for AF Start Position.  I cannot for the life of me find anything on this in the user manual.  I have a photo of it below along with the options if it is selection (Manually Selected AF point vs Registered AF point).  Would anyone be able to shed some light on this and what the two options enable?

Thanks!

Bryce

[p4pictures]

The first option would mean that the camera overrides the current focus point position. The options are for a manually set position or the registered AF point position. This setting allows you to force the AF point to a specific part of the frame when you press the back button. If you are using whole area AF then this setting is irrelevant.