Make Categories "term-select"

functions.php

/** Place any new code below this line */
add_filter( 'submit_job_form_fields', 'custom_submit_job_form_fields' );

function custom_submit_job_form_fields( $fields ) {

    // Here we target one of the job fields and change it to Single-select
    $fields['job']['job_category']['type'] = "term-select";

    // And return the modified fields
    return $fields;
}