Canon EOS R3 Advanced User's Manual page 115

Menu Setting Procedure
1.
Display the menu screen.
Press the <
2.
Select a tab.
Each time you turn the <
will switch. You can also switch tabs by pressing the <
Turn the <
3.
Select an item.
Turn the <
> button to display the menu screen.
> dial, the main tab (group of functions)
> dial to select a secondary tab.
> dial to select an item, then press <
115
> button.
>.