The Supernovae page allows you to decide if the supernovae are displayed or not by checking the Show supernovae checkbox. By default, supernovae are drawn as small light orange “+” mark. As for satellites, the color of supernovae can be easily customized using the Colors page.
You can set the magnitude limit for showing a supernova as well as magnitude limit for supernova alerts using the spin boxes control. The limiting magnitude is the faintest apparent magnitude of an skyobject that is visible with the naked-eye or a telescope.
The list of recent supernovae can be updated via the → → menu item.