The Simulate core / cavity split page shows the model in the current shading mode, rather than in wireframe mode.
If you are only splitting the part, you will have two solids; one for the core and the other for the cavity.
The original solid is encased in the two halves of the die.
A table showing the sets of Cavity/Core/Inserts is displayed in the Creating Inserts section of the browser window. You can check the items by clicking on each icon in turn.
This displays the page from which you select the core and cavity plates from the catalogue.