This filter can be used for adding new field types in the popup of the form editing page.
Changelog
Since 7.0.0 version
Parameters
$fields (type: array) - the array of the custom fields that should be added in the popup of the form editing page
Usage
add_filter("wpdiscuz_form_custom_fields", function ($allowedFieldsType) {
$allowedFieldsType[] = [
"type" => "customType",
"title" => "CustomField",
];
return $allowedFieldsType;
});