On my site new.ckvreehorst45.nl I use de sport template. In the main menu we have the item 'competitie' In the menu are more menu levels. All the levels are folded out. Is it possible to let the sublevels fold out by mouseover so the menu is default not a very long list

Hello,
its possible, but only for 2 level submenu
Add this css coe to your css/custom.css.uk-nav-navbar > .uk-parent > .uk-nav-sub { display: none; }

.uk-nav-navbar > .uk-parent > a:after {
content: "\f107";
font-family: "FontAwesome";
display: block;
float: right;
}

.uk-nav-navbar > .uk-parent:hover > .uk-nav-sub {
display: block;
background: none repeat scroll 0 0 padding-box #fff;
border: 1px solid rgba(0, 0, 0, 0.12);
box-shadow: 0 6px 8px rgba(0, 0, 0, 0.3);
width: 200px;
margin-top: -5px;
padding: 15px;
position: absolute;
left: 150px;
}