How to Hide Text To Speech TTS Accessibility Admin Menus

function plt_hide_text_to_audio_menus() {
	//Hide "Text To Speech".
	remove_menu_page('text-to-audio');
	//Hide "Text To Speech → Text To Speech".
	remove_submenu_page('text-to-audio', 'text-to-audio');
	//Hide "Text To Speech → Affiliation".
	remove_submenu_page('text-to-audio', 'text-to-audio-affiliation');
	//Hide "Text To Speech → Support Forum".
	remove_submenu_page('text-to-audio', 'text-to-audio-wp-support-forum');
	//Hide "Text To Speech → Upgrade".
	remove_submenu_page('text-to-audio', 'text-to-audio-pricing');
}

add_action('admin_menu', 'plt_hide_text_to_audio_menus', 1000000000);

Where do I put this code?