Canon EOS-1 DX Mark III Advanced User's Manual page 92

Menu Setting Procedure
1.
Display the menu screen.
Press the <
2.
Select a tab.
Each time you press the <
functions) will switch.
Turn the <
3.
Select an item.
Turn the <
> button to display the menu screen.
> button, the main tab (group of
> dial to select a secondary tab.
> dial to select an item, then press <
92
>.