For the best viewing, click on the icon with two arrows pointing in opposite directions to the right and a little below this message. That will change the gallery to full page. Press the arrows again to return to the normal view.
You can then click on any of the photos and it will enlarge to full screen. If you want to view as a slide show, click on any image. Then click on the "play" arrow in the lower left. You can do this both in normal view and in full page view.