Change Finder preferences on Mac
To change these preferences, click the Finder icon in the Dock, then choose Finder > Preferences.
Show these items on the desktop
Show connected hardware on the desktop.
New Finder windows show
Choose which folder is displayed when you open a new Finder window.
Open folders in tabs instead of new windows
Open folders in tabs instead of windows when you press and hold the Command key and double-click a folder.
Show these tags in the sidebar
Customize the tags you see in the Finder sidebar.
Customize the tags you see in the shortcut menu that appears when you Control-click a file.
Show these items in the sidebar
Show the items you use often or want to open quickly in the Finder sidebar.
These items also appear in Open and Save dialogs. See Customize the Finder toolbars.
Show all filename extensions
Show all file extensions, even for files that have “Hide extension” selected.
When deselected, file extensions are shown or hidden based on their individual “Hide extension” settings.
A filename extension—the period followed by a few letters or words that you see at the end of some filenames (for example, .jpg)—identifies the type of file. This option affects most, but not all, filenames.
Show warning before changing an extension
Display a warning if you accidentally try to change an extension. As a rule, you shouldn’t change filename extensions.
Show warning before removing from iCloud Drive
Display a warning so you don’t accidentally delete items from iCloud Drive.
Show warning before emptying the Trash
Display a warning so you don’t accidentally delete items in the Trash. See Delete files and folders.
Remove items from the Trash after 30 days
Remove items permanently 30 days after being moved to the Trash.
Keep folders on top: In windows when sorting by name
Show folders in alphabetical order first, then show files alphabetically after folders when sorting by name in a Finder window. See Sort and arrange items in the Finder.
Keep folders on top: On Desktop
Show folders in alphabetical order first, then show files alphabetically after folders on the desktop.
When performing a search
Choose what you want to search by default when you use the search field in Finder windows. You can search your entire Mac, the folder that’s currently open, or the scope you specified the last time you searched in a Finder window.