Redirect logout to PMPro login page.

logout_url_redirect_pmpro.php

<?php

// Copy from below here...

/*
 * Redirect logout to custom page with slug 'logout'.
 */
function my_logout_url_redirect_custom( $logout_url ) {
	$redirect_url = home_url( '/logout/' ); // Adjust slug if needed
	$logout_url = add_query_arg( 'redirect_to', urlencode( $redirect_url ), $logout_url );
	return $logout_url;
}
add_filter( 'logout_url', 'my_logout_url_redirect_custom' );