How to Remove the second menu ?

Could you please give us more information? What theme are you using? What are the two menus you mention?

A link to your website could also help.

https://oi66.tinypic.com/288xl03.jpg
Look this screenshot. Here you can see the menu what I’m talking about.
I want to don’t see it on the other pages.
This is the link of my website : https://orthodouches.ch/chisiamo/

.content-wrapper .content-info
{
display: none;
}

add above code to your style.css which is disappear your second menu.

.content-wrapper .content-info
{
display: none;
}
.content-wrap .blog_post h1{
-ms-word-wrap: break-word !important;
word-wrap: break-word !important;
}
#crumbs,.blog{
-ms-word-wrap: break-word !important;
word-wrap: break-word !important;
}
I just did what u sayd, but I still have the second menù. I paste your instructions on the main style.css . Please explain me better what I have to do, thank you.

If you want the menu to show on the home page only try to add this to your style sheet:
`.page #menu {
display: none;
}
.home #menu {
display: block;
}’

Sorry, I finally see that you are trying to remove the breadcrumbs and that for some reason display:none; does not remove it. I think you might have to remove it from the php templates that create the pages.