Be sure to check the box beside the pictures to make these tools available.
The preview thumbnail will give you an idea of what the slide will look like. When the pictures don’t encompass the entire slide, you’ll be able to change the Frame shape to apply settings such as rounded rectangles or soft edges.The default photo album uses a Fit to Slide Picture Layout, which fills each slide with a picture. You can change the picture layout to multiple pictures or multiple pictures plus slide title.
