pinochico
Hi
It seems you missing the post when applying it. This navigation will not for for T4 template
See this : http://prntscr.com/sb6i93
You posted this question on T4 forum. Now, if first kindly cofirm that you need it on which template
so i can move this thread to correct template forum and submit your site login details in Edit fields.
There will be difference in width and style the documentation pages are differently designed, they are custom.
Hope you got that JoomlArt.com site doc pages are custom designed and not using exact same view to load navigation.