EOS R6 Mark II - No custom functions (like C.Fn1) appear in the Custom Functions menu

[gladivs]

I want to set a Custom Function on my R6 Mark ii but none of the 5 possible functions are listed in the Custom Function section.  Any suggestions?  Ultimately I'm trying to the R6 to leave the display blank except when I go into the menu or when I playback a photo.  I read this is a place to do that.  Screen/viewfinder display is set to AUTO2.  I don't use the display to frame a shot, I use the viewfinder.  

[kvbarkley]

This is not a custom function, just set the review to "Off"

[gladivs]

Thank you.  I guess I'm really looking to have the R6 display act like Canon's previous generation.  If I'm not using the display to frame the photo I'd like it to be off, but I still want to review the photos on the display and sometimes get into the menu and make changes.  I know the sensor turns the display off when I use the viewfinder.