Filter through used and unused images in the Photos Tool Panel.
To locate this feature, open the photos tool panel on the right-hand side. At the top, there is a drop-down where you can filter between your used and unused photos.

Filter through used and unused images in the Photos Tool Panel.
To locate this feature, open the photos tool panel on the right-hand side. At the top, there is a drop-down where you can filter between your used and unused photos.