gpeu_forms

add_filter( 'gpeu_forms', 'my_custom_function' );

add_filter( 'gpeu_forms', function ( $forms ) {

	$allowed_forms = array( 123, 456, 789 ); // Replace with Form IDs

	$limited_forms = array();

	foreach ( $forms as $form ) {
		if ( in_array( $form['id'], $allowed_forms ) ) {
			array_push( $limited_forms, $form );
		}
	}

	return $limited_forms;
} );