Same thing was happened with me.
Back glass was broken at one edge while the phone just slipped from 1 inch and hit the floor very veryy lightly.
Very delicate phone, really making us fool by saying both the sides are protected with gorilla galss.
I feel sorry for you. But you have just assumed too much. A phone display is glass and every glass is fragile. All smartphones use a similar touch glass setup.
Gorilla glass is just a slightly toughened and scratch resistant glass. It is still a glass and is prone to breaking if it gets hit against another hard object.
I am a Nokia user like you, not a Nokia employee. I have a Nokia 7, with glass on both sides. Been using it for over an year now and it is still perfectly fine.
The impact that appears minor to you might not be minor for the glass. Anyhow, Nokia (or any other company) will not help you with this. You need to visit a Nokia care point to know the cost of a replacement display. It will be a pricey component though and will cost you approximately 50% of your phone's value.
The touch and display are fused together and come as a single unit. So, even if your display works, the entire display assembly will be replaced. This is the same for most of the modern smartphones. Unofficial repair shops can sometimes manage to replace the glass only, but that is on your own risk.
Totally in agreement with user1536304021832, I saw multiple scratches within 1 week of use(cautious, new phone is always cared for couple of weeks). I raised this issue with Nokia customer care and got reply as - it scratch resistant not scratch proof. I have used MI note 4 and it screen is far better than Nokia 6.1 plus in term of durability.
Gorilla glass is for scratch protection for for breakage protection. Get a tempered glass. this is a standard for any mobile. My friend had iphone x and it also fell and broke. 1L rupee phone. how can we expect 16k phone will not break.