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.  

[p4pictures]

Since the Godox units don't have the weather sealing they will physically fit the camera. However please note that a large number of posts in the forums here tell the tale of third party flash triggers not being compatible with the EOS R-series mirrorless cameras. This is the fault of the third party units since Canon's own triggers and flashes work correctly. 

I have two "parallel" sets of flash kit myself. I have the Canon set with Canon transmitters ST-E3-RT and ST-E10 plus Speedlite 600EX-RT, Speedlite 600EX II-RT Speedlite 430EX III-RT. Then I have a Godox set with the AD200 Pro and Xpro-C trigger. The Canon set has less power but works without fault, the Godox mostly works, but sometimes has random very overexposed results and some features cannot be set from the camera menus only on the Xpro-C itself. 

[gladivs · Accepted solution]

Thanks Brian.  I have the same issues with my current camera & Godox.  I'm shooting manual all the time and most photos are well exposed, but then I get a sequence where it is way over exposed.  I'll give things a try.  Thanks everyone for your suggestions, I'll go ahead and close this now.