The Samsung Galaxy S9+ has an expansive and near bezel-less, edge-to-edge 6.2-inch Quad HD+ Super AMOLED Infinity Display. Sleek and stunning, the screen and the bezel blend together to form a seamless design, with drop-resistant Corning® Gorilla® Glass 5 on both the front and back for durability and a high-quality finish.
As I mentioned on your post, Samsung provides 12 months warranty from the date of purchase of the phone. Unfortunately, the screen damage would be not covered under warranty. If you have purchased Samsung Care+ plan then you can avail it. However, you will be charged for service and you can call on 1-877-699-1356 to initiate a service request for Samsung Care+ plan.
Follow the below link to know more details about Samsung Care+. https://www.samsung.com/ca/offer/samsung-care-plus/