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.
You can open an existing UI Document in multiple ways:
Assetsfolder (Project tab) More info
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.