How to Hide the "BrenWP Safe Mode" Admin Menu

function plt_hide_brenwp_client_safe_mode_menus() {
	//Hide the "BrenWP Safe Mode" menu.
	remove_menu_page('brenwp-client-safe-mode');
}

add_action('admin_menu', 'plt_hide_brenwp_client_safe_mode_menus', 1000);

Where do I put this code?