Use the File Management Preferences dialog to customize the file manager.
To display the File Management Preferences dialog, choose Edit → Preferences. You can also access this dialog directly from the top panel menubar by choosing System → Preferences → File Management.
You can set preferences in the following categories:
Default settings for views
Behavior of files and folders, executable text files, and Trash
Information that is displayed in icon captions and the date format
Columns that appear in the list view and their order
Preview options to improve the performance of the file manager
How removable media and connected devices are handled