src/admin/class-papi-admin-entry-post.php
public function hidden_meta_boxes() {
		global $_wp_post_type_features;

		if ( isset( $_wp_post_type_features[$this->post_type]['editor'] ) ) {
			return;
		}

		add_meta_box( 'papi-hidden-editor', 'Papi hidden editor', [$this, 'hidden_meta_box_editor'], $this->post_type );
	}
public function hidden_meta_boxes() {
		global $_wp_post_type_features;

		if ( isset( $_wp_post_type_features[$this->post_type]['editor'] ) ) {
			return;
		}

		add_meta_box( 'papi-hidden-editor', 'Papi hidden editor', [$this, 'hidden_meta_box_editor'], $this->post_type );
	}
Output hidden meta boxes.