Canon EOS-1D X Mark III Advanced User's Manual page 870

: Register/Recall Shooting Function
You can manually set the main shooting functions and register them to the camera. As long
as you hold down the button assigned to this function, you can apply your registered
shooting function settings as you shoot.
* 8: To access the detailed settings screen when the setting screen is displayed, press the <
button. Turn the <
[ ]. To configure function details, select an item, then press <
restored by pressing the <
To register the camera's current settings, select [Register current settings]. For instructions on
registering AF points, see
Caution
These setting details are not applied when a Speedlite EL-100 is attached.
> or < > dial to select an item, then press <
> button.
Registering the AF Point.
870
> to add a checkmark
>. Default settings can be
>