Hello,

The underline is part of theme style to indicate the active menu item. Because you have links to sections in the same page, there are several of them underlined while in homepage. To remove it add this css:

.header_container.menu_style-border_bottom.menu-text-style #navigation nav > ul > li.current-menu-item > a {
    border-color: #ffffff00 !important;
}

Best regards!

Hello,

Yes, please add this code too:

.header_container.menu_style-border_bottom.menu-text-style #navigation nav > ul > li.current-menu-item > a:hover {
    border-color: #ffffff !important;
}

Best regards!

Hello,

Please clear cache and hard refresh. Let me know if you still can not see it.

Best regards!

Hello,

Please add some wp credentials in your profile. So i can check this closely. Read this article for more information.

Best regards!

Hello,

I edited the code. Please clear cache and refresh page. It’s ok now, i checked.

Best regards!