Firstly this is for **High** Sierra

i've already tried this step :

> https://apple.stackexchange.com/questions/254094/character-accent-menu-doesnt-appear-anymore-in-macos-sierra/254161

 - Add a second language like French in Settings -> Keyboard -> Input Source
 
 - When i type `defaults read -g ApplePressAndHoldEnabled` in a Terminal
   i got a `1`
 - Go into Settings, Keyboard and make sure the Key Repeat slider is set to Slow and the Delay Until Repeat slider is set to Short.

Even if i restart the Accent Menu doesn't appears.

And this is my Mac :

> macOS High Sierra | version 10.13, MacBook Pro (Retina, 15-inch, Mid 2015)