Tips on Customizing RSS for Yandex Turbo

How to Hide the "Яндекс.Турбо" Admin Menu

function plt_hide_rss_for_yandex_turbo_menus() {
	//Hide the "Settings → Яндекс.Турбо" menu.
	remove_submenu_page('options-general.php', 'rss-for-yandex-turbo.php');
}

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

Where do I put this code?

How to Hide the "Яндекс.Турбо" Meta Box

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

	//Hide the "Яндекс.Турбо" meta box.
	remove_meta_box('yturbo_meta_box', $screen->id, 'normal');
}

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