Hello,
It is highlited because your Sale page is the Shop page with query – http://prntscr.com/r5jp9n
Add the next Custom CSS code:
.woof_search_is_going .header-main-menu.et_element-top-level .menu li#menu-item-7764 a {
color: white;
}
.woof_search_is_going .header-main-menu.et_element-top-level .menu li#menu-item-7764 a:before {
display: none;
}
Regards