If you make changes to assets in a project, then decide you want to eliminate those changes, you can do so using the Remove button in the Project tab. If you delete an asset created in a previous project and revert your deletion, the asset returns to its pre-project location and state.
Keep in mind that you can revert changes only to assets created in other projects: attempting to undo changes made to an asset in the project it was created causes all actions associated with that asset to be reverted, including its creation. Such assets will be permanently deleted.
To revert assets to their pre-project state:
In the Project tab, find the assets that have changes you want to remove.
Click the checkbox beside each asset.
Click the Remove button.
The assets are removed from the Project tab.
