Hi.

Yes, you can create two Categories New and Used and set different pages for them.

https://take.ms/Hnzu9

Now only with css or template edit, but we plan to add customization for sort fields in the near future (7 -10 days).

Add to css

#pix-sorting{
  display: none;
}

Do you use child theme?

In this case, all your changes are saved during the update.

You are welcome)