Hello
I dont want avoid scroll of page but i want a usable menu 
It’s the same problem if you do a fixed menu on right side for example https://www.atdesign.be/
in landscape mode you can’t access to itms at bottom
It s explained here
[TUTORIAL] Make mobile menu SCROLLABLE
But you have right with a scroll in menu it’s ok and i can use interaction to hide other section when we scroll into the menu (like that jquery - How to disable scrolling in the background when the mobile menu is open? - Stack Overflow)
Thanks