The total number of layers is capped at 10 so there should be at max 8 intermediate layers with 100 nodes (that's still quite a lot). Are you sure that the settings don't open at all? What happens if you wait for a bit?
If waiting doesn't help the only option I can think of would be to delete the PlayerPrefs file. (Follow the path described in the link - the company name should be my name and product name should be Evolution)