How to make repeatable, sortable text fields with two text fields per item

Try setting an array of multiple labels with the label argument in the field definition array.

...
'label' => array(
    'first' => __( 'First', 'your-text-domain' ),
    'second' => __( 'Second', 'your-text-domain' ),
),
...

Sadly, that didn’t do it. In fact, it didn’t do anything. Any other ideas?

In order for it to work, the framework version needs to be at least v3.5.8 or above. So can you check your version?

That did it. Thanks!

Glad it helped!