add_action('product_designer_panel_tab_content_editor', 'product_designer_panel_tab_content_editor_20200808', 0);

function product_designer_panel_tab_content_editor_20200808($atts){


    $settings = isset($atts['settings']) ? $atts['settings'] : array();
    $menu_position = isset($settings['menu_position']) ? $settings['menu_position'] : 'left';

    $icons = isset($atts['icons']) ? $atts['icons'] : '';
    $cube = isset($icons['cube']) ? $icons['cube'] : '';

    ?>
    <p>Custom html</p>
    <?php

}

 

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