The Render (Properties) > Show Surfaces command is available by right-clicking the hub or shroud curve, or one of the blade curves. Use this command to view the surface instead of the raw curve file data.
Note: The blade surface and resulting mesh can be adversely affected when a blade shroud tip is defined by the second-last profile and the last profile has a shape that is inconsistent with where the blade would exist if the blade were extended in the spanwise direction while ignoring the last profile. To avoid this problem, you can either ensure that the last profile is consistent with the second last profile, or manually remove the last profile from the curve file. A similar statement applies for the hub end of a blade having a hub tip.