When you use a vertical monitor, you’re able to read and skim through much larger portions of your work at once. Since lines of code don’t get very long, the width of a monitor doesn’t come into play when writing or reading through your code the way it does for photo or video editing work. So, turning a monitor into portrait mode makes the best use of your screen space. Of course, you’ll want to pair that with a monitor in landscape mode to see the results.