acf-field-groups-settings-tabs.php

<?php
add_action('acf/render_field_group_settings', 'hwk_acf_field_groups_add_settings_tabs', 10);
function hwk_acf_field_groups_add_settings_tabs($group){
    // Tab
    acf_render_field_wrap(array(
        'label'         => __('Basic','acf'),
        'type'          => 'tab',
        'name'          => 'hwk_tab_basic',
        'key'           => 'hwk_tab_basic',
        'prefix'        => 'acf_field_group',
        'placement'     => 'top',
        'endpoint'      => 0
    ));

    // Accordion
    acf_render_field_wrap(array(
        'label'         => __('Accordion','acf'),
        'instructions'  => __('Instructions','acf'),
        'type'          => 'accordion',
        'name'          => 'hwk_accordion',
        'key'           => 'hwk_accordion',
        'prefix'        => 'acf_field_group',
        'open'          => false, // true | false
        'multi_expand'  => false, // true | false
        'endpoint'      => 0
    ));
}