sign to the right of Gallery.
Some of the sub menu items in the expanded menu list e.g. Birds can be expanded by clicking on the + sign to the right of Birds.
By clicking on the thumbnails on these pages you will be shown the photo in a larger size. You can then use the left
and right
arrows to page through the photos within the selected gallery. By using the up arrow 
you will be returned to
the page one menu level up.