Selecting unused images
Another option allows you to delete all images that are not used in your boards. The option is available in the Project menu.

Clicking it will move images to the Trash, where you can delete them permanently or restore them.
Another option allows you to delete all images that are not used in your boards. The option is available in the Project menu.

Clicking it will move images to the Trash, where you can delete them permanently or restore them.