Once deleted all the deleted media files and folders will be stored in the trash bin. You can either permanently delete folders/files from the trash bin or restore them back to the destination folder directly from the trash bin.
Permanently delete files/folders from trash
To permanently delete the files/folders from the trash bin just select single or multiples files/folder you want to delete permanently and then click on the Permanent Delete button on the top ribbon.
If you accidentally deleted any file/folder then it can be restored from the trash. To restore them back to the destination folder select the files/folders you want to restore and click on the Restore button on the top ribbon.