Rebar elements in a model are contained within host elements. In hidden line view they are obscured by the host. You can set overrides for each view in a project, so the rebar design can be documented.
Each rebar element (including rebar couplers) has a view visibility setting, which is an instance property. View Visibility settings for new rebar defaults are as follows:
- On in the current view.
- On in all section views in the project.
- Off in all other views in the project.
- Select all rebar instances and rebar sets to be made visible. To select multiple instances, hold down the CTRL key while selecting.
- On the Properties palette, click the View Visibility States Edit button.
- In the Rebar Element View Visibility States dialog, select the views in which you want the rebar to be viewed unobscured, regardless of its visual style.
The rebar will not be obscured by other elements and remain visible in front of all obscuring elements.
Note: Rebar elements that are cut by the cut plane are always visible. This setting has no effect on the visibility of these rebar instances.
Obscured (default setting) Unobscured 
Disable this parameter to hide the rebar in all Visual style views other than Wireframe.
- Optionally, select the 3D views in which you want the rebar to be viewed as Solid. This is its true volumetric representation when the view level of detail is set to fine. Rebar coupler elements are always viewed as solids in 3D views.
Default 3D view of rebar Rebar as a solid 