[7.2.0] Dashboard does not utilize full available screen width and is restricted to two columns

With the responsive UI update in 7.2, the dashboard screen no longer fills the available width of the screen. On my monitor, it appears in two columns that fill slightly more than 2/3 of the screen width. I am unable to drag tiles over to a third column.

I tested different display scaling sizes to increase the available screen size and all of the sizes I tested still only had two columns which used less and less of the available screen width.

I would expect the number of columns to be the maximum possible for a specific screen width, with a layout saved for each possible number of columns. If the window size changes, then it increases or decreases the column layout displayed as necessary. Whatever the number of columns displayed, they would fully fill the available screen width. So the column widths would stretch or shrink until a column is added or removed.