Fixed Price / Add to Cart
When enabled, the fixed price tab will be visible and allow sellers to have the option of selling the item(s) for a fixed price so that buyers can skip the bidding process and add to cart.
When fixed price and auction are both enabled, the add to cart option for buyers is still available during the timed event and if there is only one item, the auction ends as soon as the item is paid via add to cart.
Hide the add to cart button from the admin General > marketplace settings there is an option to hide the buy now button after first bid is placed. When you have this enabled and the first bid is placed, the Buy Now button will disappear.