When you view a Dreamweaver site in the expanded Files panel, information about the files and folders is displayed in columns. For example, you can see the file type or the date a file was modified.
You can customize the columns by doing any of the following (some operations are only available for columns you add, not default columns):
Reorder or realign columns
Add new columns (for a maximum of 10 columns)
Hide columns (except the filename column)
Designate columns to be shared with all users connected to a site
Delete columns (custom columns only)
Rename columns (custom columns only)
Associate columns with a Design Note (custom columns only)