Help! Question about the file F1Graphics?

Hello everyone, I am writing this post to see if you can help me, it is that I have a very old computer (15 years old) and well I have been trying to get a mod that my PC can run, and well I think I got one, but I did not It runs quite well and it is that from what I see in Grand Prix 4 the game necessarily makes you see all 22 cars on screen, I remember that years ago I played rfactor and there was an option to choose how many cars you wanted to see on screen ... I always chose half ... So I wanted to know if there is a similar option in this game within the F1graphics file? Well that's all friends I hope you can help me!

Sorry for the bad English!