Preferences

Unity provides a number of preference panels to allow you to customise the behaviour of the editor.

General


Auto Refresh	Should the editor update assets automatically as they change?
Always Show Project Wizard	Should the project wizard be shown at startup? (By default, it is shown only when the alt key is held down during launch)
Compress Assets On Import	Should assets be compressed automatically during import?
OSX Color Picker	Should the native OSX color picker be used instead of Unity’s own?
Editor Analytics	Can the editor send information back to Unity automatically?
Show Asset Store search hits	Should the number of free/paid assets from the store be shown in the Project Browser?
Verify Saving Assets	Should Unity verify which assets to save individually on quitting?
Skin (Pro Only)	Which color scheme should Unity use for the editor? Pro users have the option of dark grey in addition to the default light grey.


External Script Editor	Which application should Unity use to open script files?
External Script Editor Args	Windows only. What arguments to pass to external script editor. $(File) will be replaced with a path to a file being opened. $(Line) will be replaced with a line number that editor should jump to. See examples below.
Editor Attaching	Should Unity allow debugging to be controlled from the external script editor?
Image Application	Which application should Unity use to open image files?
Asset Server Diff Tool	Which application should Unity use to resolve file differences with the asset server?
Android SDK Location	Where in the filesystem is the Android SDK folder located?
iOS Xcode 4.x support	Should support for Xcode 4.x be enabled for iOS build targets?

Examples for script editor args:

Gvim/Vim --remote-tab-silent +$(Line) "$File"

Notepad2 -g $(Line) "$(File)"

Sublime Text 2 "$(File)":$(Line)

Notepad++ -n$(Line) "$(File)"

This panel allows you to choose the colors that Unity uses when displaying various user interface elements.

This panel allows you to set the keystrokes that activate the various commands in Unity.


Use Cache Server	Should the cache server be enabled?
IP Address	IP address of the cache server, if enabled

Unity Hotkeys

Building Scenes