How to Hide OAuth 2.0 client for SSO Admin Menus

function plt_hide_oauth_client_menus() {
	//Hide the "miniOrange OAuth" menu.
	remove_menu_page('mo_oauth_settings');
	//Hide the "miniOrange OAuth → Configure OAuth" menu.
	remove_submenu_page('mo_oauth_settings', 'mo_oauth_settings');
	//Hide the "miniOrange OAuth → Advanced EVE Online Settings" menu.
	remove_submenu_page('mo_oauth_settings', 'mo_oauth_eve_online_setup');
}

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

Where do I put this code?