Enable the Editor
By default, the WPCE is not used anywhere. You have to enable it through code.
Enable For Specific Post Types
If you want to enable the editor for any post type, you can use the wpce_enable_for_post_types filter.
Enable for Specific Templates
Sometimes it is useful to only show the WPCE editor when a specific template (usually a page template) is selected. This tends to be the case when trying to integrate the WPCE into an extisting website without having to rebuild all of the content at once.
php
add_filter('wpce_enable_for_post', function (bool $enabled, WP_Post $post) {
// Bail if this post already has a disabled WPCE editor or is not a page
if (!$enabled || $post->post_type !== 'page') return $enabled;
// Show editor in these templates
$allowed_page_templates = ['contact.php'];
$template = get_page_template_slug($post);
return in_array($template, $allowed_page_templates);
}, 10, 2);