Hide widgets by sidebar ID on members only content when the user does not have access.

my_pmpro_widget_display_callback.php

<?php
/**
 * Hide widgets by widget area ID for protected members only contnet.
 * Update the $hide_sidebars_array with the array of sidebar IDs you want to filter.
 * Add this code to your active theme's functions.php or a custom plugin.
 */
function my_pmpro_widget_display_callback( $instance, $widget, $args ) {

	// Set an array of widget areas by ID to filter.
	$hide_sidebars_array = array( 'sidebar-1', 'sidebar-2' );

	// Get the current queried object to check access.
	$queried_object = get_queried_object();

	// Check if this widget area should be filtered.
	if( in_array($args['id'], $hide_sidebars_array ) && ! empty( $queried_object ) ) {

		// Hide the widget if user doesn't have access to view the queried object.
		if ( function_exists('pmpro_has_membership_access') && ! pmpro_has_membership_access( $queried_object->ID ) ) {
			return false;
		}

	}
	return $instance;
}
add_filter('widget_display_callback','my_pmpro_widget_display_callback', 10, 3);