Go into the closet, close the door and see if you can see the screen then... Merry work better at night.
Oh my, it's seems you are definitely in a dilemma. Let's get your screen back to default brightness. Were you able to get the screen changed? If not, we will need to do a Factory Data Reset here: Factory Data Reset (Powered Off) - Samsung Galaxy S7 / S7 edge | Verizon Wireless
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