You can choose to run a Slideshow of all the photos in your currently selected Album Set, by simply selecting the Slideshow option which can be found under the View menu (top-right).
During the Slideshow, you can use the following buttons
Hint: Use the Stop button to return to the previous view (Album or Room View).
You can also choose to play the Slideshow in Full Screen Mode by selecting this icon . Simply press Esc the key to exit this mode.