To thicken 2D curve objects or edges in the normal direction and thereby convert them to 2D solid objects, in the Geometry toolbar (
Work Plane toolbar when working in the plane geometry sequence of a work plane in 3D), 
Conversions menu click 
Thicken (

). Then enter the properties of the thicken operation using the following sections:
 
    From the Geometric entity level list, choose the level of the entities to thicken: 
Object or 
Boundary (that is, edges in 2D). Then select the objects or entities that you want to thicken in the 
Graphics window. The curve objects or edges appear in the 
Input entities list. If the geometry sequence includes user-defined selections above the 
Thicken node, choose 
Manual to select objects or entities, or choose one of the selection nodes from the list next to 
Input entities.
 
    Click the Active button to toggle between turning ON and OFF the 
Input entities selections.
 
    Select the Keep input objects check box to use the selected geometry objects for further geometry operations.
 
    For symmetric thickening of open ended curves select how the line segments at the ends of the thickened object are generated. From the Ends list choose 
Straight (default) to generate straight edges in the normal direction to the input edge, or choose 
Circular to generate circular arcs tangent to the offset edges.
 
    When offsetting edges of convex corners the operation can create new edges by several methods to close the gap that would result otherwise. From the Convex corner handling list, choose 
Fillet (default) to add circular arcs that are tangent to both offset edges of convex corners, or choose one of the other available options:
 
    Select the Resulting objects selection check box to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the resulting objects consist of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the 
Show in physics (
Show in instances if in a geometry part; 
Show in 3D in a plane geometry under a work plane in a 3D component) list: 
All levels, 
Domain selection, 
Boundary selection, or 
Point selection. The default is 
Domain selection, which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose 
Boundary selection. These selections do not appear as separate selection nodes in the model tree. Select 
Off to not make any selection available outside of the geometry sequence. From the 
Color list, choose a color for highlighting the resulting objects selection. See 
Selection Colors.
 
    
    From the Construction geometry list choose 
On to make the resulting objects available only in the feature’s geometry sequence. The default option 
Inherit means that the resulting objects become construction geometry if all input objects are construction geometry. Choose 
Off to never output construction geometry objects. For more information see 
Construction Geometry.