Not talking about the zoom to fit which crops the top and bottom. Even if I had to root my phone I think it would look better than zoom to fit.
I have a S9+
If you are looking to make a 16:9 video fully cover a 18:9 (2:1) screen, most video viewers are not going to do that since virtually no one wants to see a distorted video.
If you are looking to make a 16:9 video fully cover a 18:9 (2:1) screen, most video viewers are not going to do that since virtually no one wants to see a distorted video.