Create and manage UI Documents (UXML)

The currently open and active UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Document (UXML) asset name is displayed in both the Hierarchy pane as a root tree item as well as in the Canvas header inside the ViewportThe user’s visible area of an app on their screen.
See in Glossary. An asterisk * next to the name indicates unsaved changes.

UI Builder will always start, by default, with a blank unsaved UI Document (UXML). This will display as <unsaved file>*.uxml. You can start working within this UI Document (UXML) and then create it as an asset on disk later when you save for the first time.

Open a UI Document

You can open an existing UI Document in multiple ways:

1. Use the File menu inside the UI Builder Viewport pane toolbarA row of buttons and basic controls at the top of the Unity Editor that allows you to interact with the Editor in various ways (e.g. scaling, translation). More info
   See in Glossary and select Open….
2. In the Project tab of the Library pane, right-click on the document and select Open in UI Builder.
3. In the Unity Project windowA window that shows the contents of your Assets folder (Project tab) More info
   See in Glossary, double-click on the document. if you already have the document open in the UI Builder and you double-click on it in the Unity Project window, the UI Document (UXML) will open using your default text editor or IDE.

You can save any changes to the active UI Document (UXML) by using the File > Save menu in the UI Builder’s Viewport pane toolbar. Ctrl/CMD + S might also work but the UI Builder window needs to be in focus. Note that the Unity project-wide Save won’t save the active UI Document (UXML) open in the UI Builder.