Remove

<nav id="bottomnav"></nav>

<script>
    var bottomNav = $("#bottomnav").kendoBottomNavigation({
        items: [
            { text: "Home", icon: "home" },
            { text: "Info", icon: "info-circle" },
            { text: "Contact", icon: "envelope" }
        ]
    }).data("kendoBottomNavigation");

    var lastItem = bottomNav.item(2);
    bottomNav.remove(lastItem);
</script>