SQL Developer 4.0 column width in data grid

In SQL Developer 4.0, when I view the data of one of my objects, the columns are taking up the entire width of the window.  I can move all of the columns to the left, other than the last column.  It appears anchored to the right of the window.  SQL Developer 3.2 displayed the data in a much more concise format, making it much easier to view data.  Is there any way to change this, in 4.0, so that the data is more tightly clustered together?  Thanks a lot.