I talk about 'longer field names', not longer fields. My screenshot shows how that makes sense at my medium screen size - it's pretty obvious that what I see in your screenshot is not a good use of space, .
It also looks like there are some differences on how this works out on Mac, at least compared to my Windows screen. My items column gets to a max width of about 45 characters (for the bold item name).
I don't share your wish to use Enpass full screen on a 4K monitor, or to keep extensive notes. That doesn't make your request invalid of course.