How to restore a covered scene in Unity.

In Unity, if a scene is covered, you can take the following steps to restore it:

1. Open the project in Unity editor.
2. Choose “File” from the menu bar, then select “Build Settings.”
3. Click on the “Add Open Scenes” button in the Build Settings window.
4. In the scene selection window, choose the scene that is covered.
5. Click on the “Open” button to add the scene back to the Build Settings.
6. Ensure that the overwritten scene is in the correct position in the scene list in the Build Settings window.
7. Save the Build Settings.
8. Reopen the covered scene and check if it has returned to normal.

If the above steps do not solve the issue, you may need to check the following points:

1. Check if the scene file exists in the project folder and has not been accidentally deleted or moved.
2. Check if the scene file can be opened correctly without any damage or missing resources.
3. Check to see if there are any other actions or settings that could be causing the scene to be overwritten, such as version control, scene switching, or project settings.

If the issue persists, you may need to seek further assistance from the Unity community.