You can use the slider to change the range of what is shown, out to the limits of what the game allows you to see. I use 4 most of the time, unless I'm simply traveling and want to just get where I'm going and avoid contacts.
The menu is right in the radar window. You should see two "buttons" one says "SHOW" (alternately it says "HIDE") and the other says "SETTINGS". Press the settings one to get the box with all the little buttons for changing what things you see and what you don't, as well as the second tab that allows you to turn labels on and off, and other such goodies, like z axis.
If you see none of that, I suggest you close the game and go into
..\Inner Space\Extensions and send the files for the radar to the recycle bin. When you restart ISXVG it should recreate them properly. If not then you may need to get the program in the .NET section of the boards called
VGSkin and put it in your "
.NET Programs" and then open the Inner Space console and run it as explained in that post (use the link I gave "VGSkin").
This last will probably work best out of game and from the desktop console. I don't know if it is meant to work from ingame. I would think it should not.
I hope that helps.