If you want to delete the photo from its album in Family Tree Builder:
Go to ‘Photos’ section in Family Tree Builder, open the album, select a photo in the list and make a right-click on the photo. Select ‘Remove photo from album’ option.
Note: This action will not delete the photos from your project completely, but only from the specific album.
If you want delete a photo from your project completely:
Go to ‘Photos’ section, select the photo that you want to delete, and either click ‘Delete’ button on the upper toolbar, or make a right-click on the photo and select ‘Delete’ option.