In some cases you may want to show only used or new vehicles along with the search options.
The most common use case for this would be for independent dealerships. Since they only have used vehicles it doesn't make sense for there to be a search new link within the inventory pages.
To change this setting go to CarDealerPress > Settings > General > and change the Sale Class Filter to New/Used/Certified based on your needs.
Note: you can also turn off the Certified search on used vehicle sites by going to > Settings > Theme > then toggle the "Hide Certified Saleclass" option.