In each of these slideshows, notice the little red button on the right (near the bottom of the photos) as that button will take you in / out of the slide show FULLscreen setting. The ESC key on your keyboard (far upper left) gets you OUT of this slideshow.
Many of the videos on this website are from this youtube channel:
FYI – The slideshows move at THEIR speed, if you try to hurry it, I have found that you will be sorry! ha. Seriously, have fun!