How to Hide Aiify - ChatGPT, Ollama and OpenRouter AI Copywriting, Content Writing and Editing Admin Menus

function plt_hide_aiify_menus() {
	//Hide "Aiify Blocks".
	remove_menu_page('aiify');
	//Hide "Aiify Blocks → Aiify Blocks".
	remove_submenu_page('aiify', 'aiify');
	//Hide "Aiify Blocks → Contact Us".
	remove_submenu_page('aiify', 'aiify-contact');
	//Hide "Aiify Blocks → Upgrade".
	remove_submenu_page('aiify', 'aiify-pricing');
}

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

Where do I put this code?