Slideshow Properties panel

Slideshow properties apply to the currently selected slide show.

Apply To All Albums

Apply the specified options to all albums in the AlbumBook.

Interval

Number of seconds between each image.

Use Transition

Select a specified transition effect between images.

First Image

Set the first image in the album. This is the sequence number of the image in the album.

Display Sequence

Choose whether to display images in order or randomly.

 community help (adobe.com)