.am-filter-items-category_ids .items-children {
    padding-left: 0px !important;
}

ul.am-filter-items-category_ids>li a {
    display: none !important;
}
ul.am-filter-items-category_ids li a {
    display: none !important;
}
ul.am-filter-items-category_ids ul.level-2 li a {
    display: block !important;
}