Canon EOS-1D X Mark III Advanced User's Manual page 779

6.
Exit the setting.
When finished, press the <
step 2.
7.
Review your setting screen.
Sample screen
Confirm that [Custom Quick Control screen] in [ :
display options] has a checkmark [ ] (
Press the <
( ), then check the layout.
> button to return to the screen in
> button to display the Custom Quick Control screen
779
button
).