This is by design. Solid Edge 2D Drafting is primarily intended to be used as a 2D drafting tool. It does open Solid Edge native Draft files and all the geometry will display including drawing views. However, it is not intended to be used for annotating drawings created from 3D models. This is why the drawing views are disabled. Solid Edge users can use 2D Drafting for collaboration purposes such as markup to send back to the original owner. It can also be used to open the Draft files and print them in the native Solid Edge Drafting format.