This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
Plugin::load_front_end()
Loads the front-end
Source
File: includes/libs/plugin.class.php
private function load_front_end(){
// start the REST API compatibility
$this->rest_api = new Rest_Api( $this->get_cpt() );
// start the front-end functionality
$this->front_end = new Front_End( $this );
}