are admin_head not possible to use?

i try to use your tool with admin_head action filter but doesn’t work:
i try with no results:

<?php
function kootj_custom_fonts() {
    echo '<style>#woocommerce-order-items tbody tr .wc-order-edit-line-item-actions { visibility: visible !important;} </style>';
?>

and

<?php
echo '<style>#woocommerce-order-items tbody tr .wc-order-edit-line-item-actions { visibility: visible !important;} </style>';
}
?>

are admin hook not possibleto use?