This Unity Editor tool, MaterialHighlighterTool, provides three key functionalities:
Highlight Objects: It highlights all objects that use a specified material by changing their color.
Switch Material: It replaces the material of selected objects with a new material.
Switch Prefab: It replaces the selected objects with a new prefab while preserving their original position, rotation, and scale.
 
Improvements:
Prefab Root Handling: The HighlightObjectsWithMaterial method ensures that only prefab roots are added to the selection, preventing nested or child objects from being selected in the editor.
Undo Support: Both the prefab switching and material switching functionalities use Undo for proper editor support, making it easier to revert changes.
 
How to Use:
Place the script in an Editor folder inside your Unity project.
Access the tool from the menu: Tools > Material Highlighter Tool.
Use the UI to select the material, color, new material, or new prefab, and click the corresponding button to apply the change.