How to Hide wp-mpdf Admin Menus and Meta Boxes - PluginTests.com

How to Hide the "WP-MPDF" Admin Menu

function plt_hide_wp_mpdf_menus() {
	//Hide the "Settings → WP-MPDF" menu.
	remove_submenu_page('options-general.php', 'wp-mpdf');
}

add_action('admin_menu', 'plt_hide_wp_mpdf_menus', 11);

Where do I put this code?

How to Hide the "wp-mpdf" Meta Box

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

	//Hide the "wp-mpdf" meta box.
	remove_meta_box('mpdf_admin', $screen->id, 'normal');
}

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