You can use the Wire page to edit the settings which affect Wire EDM simulations.
Wire visual diameter — The wires used in wire EDM are often quite thin and difficult to see during a 3D toolpath simulation. Select the Wire visual diameter option and enter a larger diameter so that the wire is easier to see during the simulation.
Tool cutting tolerance — This tolerance affects the fineness of the 3D simulation. If this is set high, the simulation appears more faceted. The lower this tolerance is set, the smoother the simulation appears.
Tool visual tolerance — This tolerance affects the appearance of the wire. By increasing this tolerance, the wire looks squarer. By decreasing the tolerance the tool looks rounder and smoother, but the simulation uses more memory and may be slower.