GUI Scale Modifier doesn't go small enough

I just installed Bedrock to try it, and I can't get the GUI Scale Modifier setting to go small enough - the UI is still way too big. I have it set to -2 which is the lowest it will let me go, but with the size of the screen I have, it should be closer to -3, maybe even -4. It feels like trying to play a mobile-only game blown up to the size of a TV. Eww. Coming from the Java edition where there's a much larger range of options, this is a huge limitation (The scale in Java Edition goes from 1 to 7, and I set the scale right in the middle at a 4). This is on a Surface Book, so the display has a really high DPI - the screen is 13.5 inches with a resolution of 3,000 x 2,000.