knk/lib/style/ajax_tree_select.less

react components based on react

.com-tree-select-no-parent {
    .ant-select-tree-switcher {
        position: relative;
    }
    .ant-select-tree-switcher_open::before, .ant-select-tree-switcher_close::before {
        position: absolute;
        top: 0;
        right: -310px;
        bottom: 0;
        left: 0;
        content: '';
    }
}