There's nothing 'official' or 'recommended'. Setting one up is part of the fun. You have options as to which one: KDE, GNOME, XFCE, IceWM, and more. You can ask for pointers on these Forums.Is there a recommended GUI desktop for FreeBSD?
Kind of like designing your own kitchen - you pick out the appliances, flooring, cabinetry, decide what goes where - oh, but you have to make sure you don't create an electrical (or gas) fire hazard along the way, or flood the place out of the sink faucet.