How to Hide Security Optimizer Admin Menus

function plt_hide_sg_security_menus() {
	//Hide "Settings → SG Plugins".
	remove_submenu_page('options-general.php', 'siteground_settings');

	//Hide "Security Optimizer".
	remove_menu_page('sg-security');
	//Hide "Security Optimizer → Dashboard".
	remove_submenu_page('sg-security', 'sg-security');
	//Hide "Security Optimizer → Site Security".
	remove_submenu_page('sg-security', 'site-security');
	//Hide "Security Optimizer → Login Security".
	remove_submenu_page('sg-security', 'login-settings');
	//Hide "Security Optimizer → Activity Log".
	remove_submenu_page('sg-security', 'activity-log');
	//Hide "Security Optimizer → Post-hack Actions".
	remove_submenu_page('sg-security', 'post-hack-actions');
}

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

Where do I put this code?