Ephemeris Options Window:
The ephemeris options window allows you to set which planets you want visible (natal and transit) along with the glyph separation (in degrees) and whether or not to show heliacal phenomena in the graph. To reach this window click on the manila folder toolbutton as shown below:
This will bring up the Graphic Ephemeris Options window:
The first two tabs (Natal Planets and Transiting Planets) contain visibility settings (whether or not to draw lines representing locations for that planet). The Main tab allows you to set the glyph separation property and whether or not to include heliacal phenomena.