Views preferences in Files

You can change how files and folders are grouped and sorted by default. Press the menu button in the top-right corner of the window, select Preferences, and then select the Views tab.

Default view

Arrange items: You can change how files are sorted in an individual folder by clicking the view options menu button in the toolbar and choosing the desired option under Sort, or by clicking the list column headers in list view.
Sort folders before files: By default, the file manager no longer shows all folders before files. To see all folders listed before files, enable this option.