Deleting a Grid/Surface

Click on the Selection Box button in the main toolbar. By left-clicking on the workspace and dragging a box with the mouse, you can select a wire grid or a solid surface, as explained in Modifying a Grid/Surface or Modifying a Group of Wires. All wires inside the selection box will be highlighted in light blue.

Go to Edit > Delete (Ctrl + Del) in the main menu to delete the selected grid or surface. There is also a button on the toolbar with the Delete command. This command is enabled when a group of wires, a wire grid, or a solid surface is selected.