Type VG and make sure Structural Framing is turned on under Model Categories.
Your View Range is probably not set to display the beams, as they are located toward the ceiling.
You should use a new Structural Framing View to place the beams, which will display them while placing them and afterwards for dimensioning/annotation, etc.
Cliff B. Collins
Registered Architect The Lamar Johnson Collaborative Architects-St. Louis, MO