Change Expiration Text From "---" to "Until Cancelled"

change-expiration-until-cancelled.php

<?php
/**
 * Change the account page expiration text to "Until Cancelled"
 * for never expiring levels/members.
 * Add this code to your site by following this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_adjust_expiration_text( $expiration_text, $level ) {
	if ( $expiration_text === '---' ) {
		$expiration_text = __( 'Until Cancelled', 'paid-memberships-pro' );
	}
	return $expiration_text;
}
add_filter( 'pmpro_account_membership_expiration_text', 'my_adjust_expiration_text', 10, 2 );