How to Hide WP Mail Pro Admin Menus

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

	//Hide "WP Mail Pro".
	remove_menu_page('wpmailpro');
	//Hide "WP Mail Pro → WP Mail Pro".
	remove_submenu_page('wpmailpro', 'wpmailpro');
	//Hide "WP Mail Pro → Metrics".
	remove_submenu_page('wpmailpro', 'wpmailpro&tab=metrics');
	//Hide "WP Mail Pro → Logs".
	remove_submenu_page('wpmailpro', 'wpmailpro&tab=logs');
	//Hide "WP Mail Pro → DNS Configuration".
	remove_submenu_page('wpmailpro', 'wpmailpro&tab=dns');
	//Hide "WP Mail Pro → Settings".
	remove_submenu_page('wpmailpro', 'wpmailpro&tab=settings');
}

add_action('admin_menu', 'plt_hide_wpmail_pro_menus', 11);
Where do I put this code?