How do I change what data columns are displayed in Media?

You can easily edit what data columns are displayed in Media. Click on the "Edit" menu option then select "View Options". In the View Options window, you can check the fields you want to display and drag-and-drop the fields into the order you want them displayed.

Once you've added the columns you want in Media, you can easily adjust their width by using the dividers between the column headers - like this.