Just to say thanks to @James for pointing this hook. Its Jan, 2021 now…
WP 5.6, ACF PRO 5.9.3
ACF pro stopped showing the keys… with “display:none”.
I went a little further, but this is the idea:
function my_acf_admin_head() {
?>
<style type="text/css">
#acf-field-group-fields .li-field-key {
display: block;
width: 15%;
}
#acf-field-group-fields .li-field-type {
width: 10%;
}
#acf-field-group-fields .li-field-name {
width: 20%;
}
</style>
<?php
}
add_action('acf/input/admin_head', 'my_acf_admin_head');