Menu Item not clickable

Hei

I have a behavior on main my menu I would like to avoid.

The theme I’m using has a top main menu. I have several pages in this menu. Some pages have children_pages.
I want an page with children_pages not to be “clickable”, no to be an hyperlink.

I tried to found some solutions.
The first one is to create my own Custom Menu. But in this case, it’s not what I want to do. I’m using the default menu of the theme, which is using top-level pages
For each page with children_pages, I have changed the “Page Links To” field to “#”
That’s a part of what I want.
But still the page is clickable in the menu (because the item contains an hyperlink). And a “click” on the page leads to a scroll to the top of the page.
That’s really not cool… My Menu is sticky: so i can read the page, scroll down and still see the menu. Then a error-click will scroll to the top and i have to scroll all the way down to finish to read my page

What is the solution ( without using Custom Menu)?
CSS is not enough (OK, i can change the a:hover but i can still click!), isn’t it?

Hope someone will understand my bad english here 🙂