Resolution has nothing to do with screen size. Resolution is how many pixels are in the display. My phone has higher resolution than your 32" display, and that's less than 6".
I game on a 28" 4k monitor. The resolution on that is 3,840x2,160, and if your PS4 Pro is hooked up to a 4k TV, that is what you're used to getting. Dropping down to a small fraction of that is going to look awful and cramped. It doesn't matter how big the screen itself is, if it's 1366x768, it just can't fit very much stuff and also look crisp. A bigger screen just means each individual pixel is bigger.
You need to base your screen size on how far away from the display you plan to sit, as bigger = farther away comfortably. But for resolution, you just flat out need one that has more. The game looks great at 4k on PC with the UI size at 150%.