When sorting on a column, if the column width is reduced enough, the sort arrow can become hidden, which makes it difficult to recognize this situation. The arrow should either always be visible or the heading should be styled differently along with the sort direction arrow. For example, making the sorted column's header backgound color blue or some other color to indicate that it is sorted would help, even if the column width is reduced to a minimum. Alternatively, add a button to "reset" the UI to help users restore their view.
