Tips on Customizing WP Job Manager

How to Hide WP Job Manager Admin Menus

function plt_hide_wp_job_manager_menus() {
	//Hide "Job Manager".
	remove_menu_page('edit.php?post_type=job_listing');
	//Hide "Job Manager → Job Listings".
	remove_submenu_page('edit.php?post_type=job_listing', 'edit.php?post_type=job_listing');
	//Hide "Job Manager → Add New".
	remove_submenu_page('edit.php?post_type=job_listing', 'post-new.php?post_type=job_listing');
	//Hide "Job Manager → Types".
	remove_submenu_page('edit.php?post_type=job_listing', 'edit-tags.php?taxonomy=job_listing_type&post_type=job_listing');
	//Hide "Job Manager → Applications Pro".
	remove_submenu_page('edit.php?post_type=job_listing', 'job-manager-landing-application');
	//Hide "Job Manager → Resumes Pro".
	remove_submenu_page('edit.php?post_type=job_listing', 'job-manager-landing-resumes');
	//Hide "Job Manager → Settings".
	remove_submenu_page('edit.php?post_type=job_listing', 'job-manager-settings');
	//Hide "Job Manager → Marketplace".
	remove_submenu_page('edit.php?post_type=job_listing', 'job-manager-marketplace');
}

add_action('admin_menu', 'plt_hide_wp_job_manager_menus', 13);

Where do I put this code?

How to Hide WP Job Manager Meta Boxes

function plt_hide_wp_job_manager_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Job Data" meta box.
	remove_meta_box('job_listing_data', $screen->id, 'normal');
	//Hide the "Types" meta box.
	remove_meta_box('job_listing_type', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_wp_job_manager_metaboxes', 20);