Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 874

: 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 < > or < > dial to select an item, then press < > to add a checkmark [ ]. To configure function details, select an item, then press < >. Default settings can be restored by pressing the < > button. To register the camera's current settings, select [Register current settings]. For instructions on registering AF points, see Registering the AF Point. Caution These setting details are not applied when a Speedlite EL-100 is attached. 874