The app will start by showing slides. They’ll be of your recent photos if you have not yet selected any. There are two modes for showing slides: with controls showing and without. If in the “with controls” mode, clicking the play/pause button of the Apple TV remote will make the controls disappear (the normal viewing mode).
If in the “without controls” mode, clicking play/pause advances the show to the next slide and will also make the controls appear. Clicking it again makes the controls disappear . For another approach, clicking (pressing ) anywhere on the Touch Surface of the Apple TV remote will make the controls appear.