Auto focus distance range photo

[GLBAMERT]

Hi all
My hardware: Canon 5dMII ;  Lens Canon EF 100-400mm f/4.5-5.6L IS USM ; ML 2.3 next
In the Wildlife photography,  the auto focus mostly caught the green in the background and the
Suddenly appearing wildlife is blurry.
I like to set the focus range distance to the expected range.
May the wildlife is turning up between 6 and 8 meters, I like to set this values for the auto focus or may only to the max value 8m.
But how can I do that?
The function is inside of ML
As example : May to use the "Focus End Point" setting from rack Focus for the normal auto focus usage.
It must not be exactly pointed.
Only to avoid that the sad auto focus of 5dmII caught the background
I have massed a lot of wildlife shots with catching the background while shooting
Cheers
Thanks for help
Uwe