Preferences

Unity provides a number of preferences that allow you to customize the behavior of the Unity Editor.

To access the Preferences window, go to Edit > Preferences (Windows) or Unity > Preferences (Mac) from the main menu in Unity. The following preference categories are available:

• General
• 2D
  • Grid Brush
  • Tile Palette
• Cache ServerA standalone app that you can run on your local computer that stores the imported Asset data to reduce the time it takes to import Assets. More info
  See in Glossary
• Colors
• External Tools
• GI CacheThe cached intermediate files used when Unity precomputes real-time GI, and when baking Static Lightmaps, Light Probes and Reflection Probes. Unity keeps this cache to speed up computation. More info
  See in Glossary

Navigating the Preferences window

Use the Search box (A) to filter the list of settings categories (B), and highlight keywords in the details pane on the right (C).

Package custom preferences

Some AssetStore or Unity packages add their own custom preferences to the Preferences window. Generally these use the package name as the preferences category. In this example, you can see the Cinemachine package preferences:

For information about a specific package’s preferences, see the documentation for that package. This section contains documentation for standard Unity preferences only.

General

General preferences allow you to customize working in Unity overall.

Property		Function
Auto Refresh		Enable this option to update Assets automatically as they change.
Load Previous Project on Startup		Enable this option to always load the previous Project at startup.
Compress Assets on Import		Enable this option to automatically compress Assets during import.
macOS Color Picker		Enable this option to use the native macOS color picker instead of Unity’s own.
Disable Editor Analytics (Pro only)		Enable this option to stop the Editor automatically sending information back to Unity.
Show Asset Store__A growing library of free and commercial assets created by Unity and members of the community. Offers a wide variety of assets, from textures, models and animations to whole Project examples, tutorials and Editor extensions. More info See in Glossary search hits|| Enable this option to show the number of free/paid Assets from the Asset Store__ in the Project Browser.
Verify Saving Assets		Enable this option if you wish to verify which Assets to save individually on quitting Unity.
Script Changes While Playing		Choose Unity’s behavior when scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info See in Glossary change while your game is running in the Editor.
	Recompile And Continue Playing	Recompile your scripts and keep running the SceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info See in Glossary. This is the default behaviour, but you might want to change it if your scripts rely on any non-serializable data.
	Recompile After Finished Playing	Defer recompilation until you manually stop your Scene, avoiding any interruption.
	Stop Playing And Recompile	Immediately stop your Scene for recompilation, allowing you to quickly restart testing.
Editor Skin		Choose which skin to use in the Unity Editor. This is only available for Plus and Pro Unity subscriptions.
	Personal	Use the light grey background with black text.
	Professional	Use the dark grey background with white text.
Enable Alpha Numeric Sorting		Enable this option to display a button in the top-right corner of the Hierarchy window, which toggles between Transform sort (the default) and Alphanumeric sort.
Device To Use		Choose which of your computer’s graphics devices Unity should use. You can leave this on Automatic unless you want Unity to use a specific device. This setting overrides any device specified in command line options.

2D

Use the Max SpriteA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info
See in Glossary Atlas Cache Size (GB) preference to set the maximum size of the Sprite AtlasA texture that is composed of several smaller textures. Also referred to as a texture atlas, image sprite, sprite sheet or packed texture. More info
See in Glossary cache folder. Whenever possible, Unity keeps the size of this folder below this level.

Grid Brush

Enable the Show Flood Fill Preview checkbox to preview the TilemapA GameObject that allows you to quickly create 2D levels using tiles and a grid overlay. More info
See in Glossary you are painting in Flood Fill mode. This option is enabled by default, but you can disable it to improve performance for large fill areas.

Tile Palette

Behavior		Description
Tile Palette Target Edit Mode		Choose how to edit a PrefabAn asset type that allows you to store a GameObject complete with components and properties. The prefab acts as a template from which you can create new object instances in the scene. More info See in Glossary instance in the Tile Palette when it is selected as the Active Target.
	Enable Dialog	Always ask how to edit the instance (either in Prefab Mode or in the Scene). This is the default.
	Edit in Prefab Mode	Edit the Paint target in Prefab mode.
	Edit in Scene	Edit the Prefab instance directly in the Scene.
Tile Palette Active Targets Sorting Mode		Controls the sorting of the Active Targets in the Tile Palette.
	None	Does not sort the Active Targets. By default, the order is determined by the order of appearance of the Targets within a Scene.
	Alphabetical	Orders the Active Targets alphabetically from A-Z, 0–9.
	ReverseAlphabetical	Orders the Active Targets reverse alphabetically from 9–0, Z-A.
Tile Palette Restore Edit Mode Active Target		Restores the Active Target in the Tile Palette to the most recently selected Target from Edit Mode when exiting Play Mode. By default, this checkbox is enabled.

Cache Server

Any time an Asset changes, Unity automatically re-imports it. Setting up a Cache Server drastically reduces the time it takes to import Assets. You can set up a Cache Server using remote hosting or stored on your local computer.

By default, the Cache Server is disabled.

To enable it, choose one of the other options from the Cache Server Mode drop-down menu:

Property	Function
Local	Use a local Cache Server on this computer. The preferences for Local storage appear.
Remote	Use a Cache Server hosted on a remote computer. The preferences for Remote hosting appear.

Remote hosting

These preferences are only available when the Use Cache Server is set to Remote.

Property	Function
IP Address	Enter the IP address of the dedicated cache server that an administrator set up.
Check Connection	Click this button to attempt to connect to the remote Cache Server.

Local storage

These preferences are only available when the Use Cache Server is set to Local.

Property	Function
Maximum Cache Size (GB)	Specify the maximum size in gigabytes for the Cache Server on this computer’s storage. The minimum size is 1GB. The maximum size is 200GB. The default cache size is 10GB.
Custom cache location	Enable this option to specify a location where you want to store the cache.
Cache Folder Location	Click the Browse button to specify a location for the cache.
Cache size is …	Message displaying the current size of the cache. Before clicking the Check Cache Size button, this appears as Cache size is unknown. After clicking the button, the calculated cache size appears in the message.
Check Cache Size	Click this to find out how much storage the Local Cache Server is using. This operation can take some time to complete if you have a large project.
Clean Cache	Delete the contents of the cache.

Colors

The Colors preferences allow you to choose the colors that Unity uses when displaying various user interface elements.

External Tools

The External Tools preferences allow you to set up external applications for scripting, working with images, and source control.

Property	Function
External Script Editor	Choose which application Unity should use to open script files. Unity automatically passes the correct arguments to script editors it has built-in support for. Unity has built-in support for Visual Studio (Express), Visual Studio Code, Xamarin Studio, MonoDevelopAn integrated development environment (IDE) supplied with Unity 2017.3 and previous versions. From Unity 2018.1 onwards, MonoDevelop is replaced by Visual Studio. More info See in Glossary and JetBrains Rider.
Add .unityproj’s to .sln	Enable this option to add UnityScript (.unityproj) projects to the generated solution (.sln) file. This is enabled by default for MonoDevelop and Xamarin Studio, and disabled by default for Visual Studio (Express) and Visual Studio Code.
Editor Attaching	Enable this option to allow debugging of scripts in the Unity Editor. If you disable this option, you can’t attach a script debugger to Unity to debug your scripts.
Image application	Choose which application you want Unity to use to open image files.
Revision Control Diff/Merge	Choose which application you want Unity to use to resolve file differences with the Asset serverLegacy - An Asset and version control system with a graphical user interface integrated into Unity. Enables team members to work together on a Project on different computers. More info See in Glossary. Unity detects these tools in their default installation locations (and checks registry keys for TortoiseMerge, WinMerge, PlasticSCM Merge, and Beyond Compare 4 on Windows).
JDK Installed with Unity (recommended)	See Android environment setup.
Android SDK Tools Installed with Unity (recommended)	See Android environment setup.
Android NDK Installed with Unity (recommended)	See Android environment setup.
Gradle Installed with Unity (recommended)	This option is enabled by default. Unity installs GradleAn Android build system that automates several build processes. This automation means that many common build errors are less likely to occur. More info See in Glossary tools under Unity/Hub/Editor/[EditorVersion]/PlaybackEngines/AndroidPlayer/Tools/gradle. If you manually install Gradle tools in another location, you can disable this option and click the Browse button to select the correct installation folder. For more information about using Gradle in Unity, see Gradle for Android.
Stop Gradle daemons on exit	Enable this option so that when you close the Editor, Unity stops Gradle. If you are using Gradle to build multiple Android Projects at the same time, disable this option as it might cause your other builds to fail.

GI Cache

The Global Illumination (GI) system uses a cache on each computer to store intermediate files used to pre-compute real-time Global Illumination. All projects on the computer share the cache.

Property	Function
Maximum Cache Size (GB)	Use the slider to set the maximum GI cache folder size. Unity keeps the GI cache folder size below this number whenever possible. Unity periodically deletes unused files to create more space (deleting the oldest files first). This is an automatic process, and doesn’t require you to do anything. Note: If the current Scene is using all the files in the GI cache, increase your cache size. Otherwise, resource-intensive recomputation occurs when baking. This can happen when the Scene is very large or the cache size is too small.
Custom cache location	Enable this option to allow a custom location for the GI cache folder. By default, the GI cache is stored in the Caches folder. All Projects share the cache folder. Tip: Storing the GI Cache on an SSD drive can speed up baking in cases where the baking process is I/O bound.
Cache Folder Location	Click the Browse button to specify a location for the cache.
Cache compression	Enable this option to allow Unity to compress files in the GI cache and reduce the size of the generated data. The files are LZ4-compressed by default, and the naming scheme is a hash and a file extension. The hashes are computed based on the inputs to the lighting system, so changing any of the following can lead to recomputation of lighting: - Materials (Textures, Albedo, Emission) - Lights - Geometry - Static flags - Light Probe groups - Reflection probes - Lightmap Parameters Tip: If you need to access the raw Enlighten data, disable Cache Compression and clean the cache.
Clean Cache	Use this button to clear the cache directory. It is not safe to delete the GI Cache directory manually while the Editor is running. This is because the Editor creates the GiCache folder when it starts and maintains a set of references to those files. The Clean Cache button ensures that the Editor releases all references to the files on disk before they are deleted.

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• 2019–04–17 Page amended

• Added Gradle for Android options to the External Tools section in 2019.1.

• Removed keys and added further options to the Tile Palette Preferences in 2019.1. NewIn20191

• Selection outline color preference for child GameObjects added in 2018.3

• New unified settings and other updates for Unity 2018.3

• Script Changes While Playing and Device To Use drop-down menus added in Unity 2018.2

• Updated list of external script editors in 2018.1