How to Hide KimaAI | AI Chatbot, ChatGPT content writer and more Admin Menus

function plt_hide_kimaai_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "KimaAI".
	remove_menu_page('kimaai');
	//Hide "KimaAI → KimaAI".
	remove_submenu_page('kimaai', 'kimaai');
	//Hide "KimaAI → Contact Us".
	remove_submenu_page('kimaai', 'kimaai-contact');
	//Hide "KimaAI → Upgrade".
	remove_submenu_page('kimaai', 'kimaai-pricing');
}

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

Where do I put this code?