Place this to your function.php
/**
ACF Select field: Fix for Safari Browser
*/
add_action('admin_footer', 'my_admin_add_js');
function my_admin_add_js() {
?>
<script>
$(document).ajaxStop(function() {
$('select.select2-hidden-accessible').on('select2:closing', function() {
$('body > span.select2-container.select2-container--default.select2-container--open').hide();
});
$('select.select2-hidden-accessible').on('select2:open', function() {
$('body > span.select2-container.select2-container--default.select2-container--open').css('display','inline-block');
});
});
</script>
<?php
}
