Add to functions.php in main/child theme Flatsome:
function custom_flatsome_remove_archive_prefix($translated_text, $text, $domain) {
if ($domain !== ‘flatsome’) {
return $translated_text;
}
if (is_category() && strpos($text, ‘%s’) !== false) {
$pos = strpos($text, ‘%s’);
if ($pos !== false) {
$translated_text = substr($text, $pos);
}
}
return $translated_text;
}
add_filter(‘gettext’, ‘custom_flatsome_remove_archive_prefix’, 20, 3);
add_filter(‘gettext_with_context’, ‘custom_flatsome_remove_archive_prefix’, 20, 3);

