Hello again. Updated plugin. The current version is 1.5.6.
Update the plugin to the latest version.
To change the headers in custom blocks, in the function.php file of your theme (it is better to use a child theme) or you can use the plugin to insert snippets, for example, Code Snippets add this code
add_filter( 'ads_custom_box_title_filter_html', 'ads_replace_title', 10, 3 );
function ads_replace_title( $title_html, $title_text, $title_color ) {
$title_html = '<h2 class="ads-custom-box-title" ' . $title_color . '>' . $title_text . '</h2>';
return $title_html;
}
Maybe after changing the headers on H2 you will have to fix a little more css