Tips on Customizing Transliterator

How to Hide the "Transliteration" Admin Menu

function plt_hide_serbian_transliteration_menus() {
	//Hide the "Settings → Transliteration" menu.
	remove_submenu_page('options-general.php', 'transliteration-settings');
}

add_action('admin_menu', 'plt_hide_serbian_transliteration_menus', 2147483647);

Where do I put this code?

How to Hide Transliterator Meta Boxes

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

	//Hide the "🌟 Light Up Our Day! 🌟" meta box.
	remove_meta_box('donations', $screen->id, 'side');
	//Hide the "Contributors & Developers" meta box.
	remove_meta_box('contributors', $screen->id, 'side');
}

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

How to Hide the "WordPress Transliterator" Dashboard Widget

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

	//Remove the "WordPress Transliterator" widget.
	remove_meta_box('transliterator_dashboard_widget', 'dashboard', 'side');
}

add_action('wp_dashboard_setup', 'plt_hide_serbian_transliteration_dashboard_widgets', 20);