I find that a 39-40" 4K screen is optimal and has about the right size pixels such that you don't need to scale the UI. I use it in portrait mode which I think

I find that a 39-40" 4K screen is optimal and has about the right size pixels such that you don't need to scale the UI. I use it in portrait mode which I think is the most effective use of screen real estate for code editing. With this setup you have less useful parts of the screen, like the very top, but you also have windows that you don't need to look at so much. I run a text editor with two windows side by side and three windows high. The smallest windows are at the top and basically double in size as you go down. The bottom ones are used to edit and the top ones are mostly used for reference. I find this arrangement incredibly productive. I have actually migrated from 3x 4K screens, which was overkill.