Try the following:
Make a new but smaller sample model using standard template, analyze the model and then design it (Rebars should be visible at this stage.) U
Use the detailer for detailing the structure. (SAFE should prepare and view the detailed drawing, at this stage).
Return to SAFE, using 'File -> Return to SAFE' menu command.
If the rebars are visible, try o determine the cause of the problem, by comparing various option settings of this sample model, with those of your actual model.
Hopefully this should solve your problem.
A good structural engineer is often a blessing for others.