Hide or Show Edges Mode Select this mode button to hide, but not delete, a portion of the object’s boundary. To hide or show the edge of a 2D polyline or polygon: 1. Select the polyline or polygon to change. 2. Click the 2D Reshape tool from the Basic palette. 3. Click the Hide or Show Edges mode button. 4. Click a vertex near the edge to be hidden. Click again to show the hidden edge.