Hi,
Use the next css to make there for few icons then the more button will be displayed highlited.
@media(max-width:991px) {
#buddypress div.item-list-tabs ul {width: auto !important;}
#buddypress div#item-nav {padding: 0;}
#buddypress div#item-nav ul li {opacity:1 !important;}
#buddypress div#item-nav .responsive-tabs {height: 102px !important;}
#buddypress div#item-nav ul li a:before { margin-bottom: 10px !important;}
#buddypress div#item-nav ul li a {padding: 0 7px;font-size:10px;}
#buddypress div#item-nav ul li a:before {font-size:44px;}
#buddypress div#item-nav a.dropdown-toggle:before {
background-color: #777 !important;
color: #fff !important;
}
}
The last selector targets only the more button so if you need to highlite only more button copy and paste only that css

The css will be added to wp-admin -> theme options -> General settings -> Quick CSS
Cheers
R