You have to set your screen to 1080 x 1920 pixels.
I have a Galaxy S5. The specifications say that it has 1080 x 1920 pixels. I set the project to be this in custom, screen seems very large. Why is this?
Because the Samsung Galaxy S5 has a high resolution and high amount of pixels per inch (PPI), you will have to have the resolution be lower than 1920x1080. To prototype it correctly for that device, you should have the resolution set to 360x640.
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