On smaller screens the Device Screen columns will be stacked and full width, but on larger screens these three columns are constrained to a combined max-width of 1000px.
This width seems arbitrary and too restrictive on larger screens. When these columns are full-width and stacked on smaller screens, they have a width that is wider than 1/3 of the 1000px max.
Some of my devices have settings in the center column that get cut off in these smaller columns.
It would be ideal if these columns were responsive to larger screen sizes.
The simplest fix would be to remove the max-width value from the styles.
Here is a feature request and more discussion.