You can choose the present mode from the collection settings (3 dots).
I found the present mode on the ipad and i am guessing on the android you are referring to the sideshow button.
The image still takes a long time to load. It can be blurry for up to and over half a minute. If i let the slideshow run, it usually moves onto the next picture before it has a chance to unblur the current picture.
The app is broken. It shows loading development version even when viewing images that are set offline editing.