Display PDFs and images as a slideshow in Preview on Mac
You can open and display multiple PDFs and image files as a slideshow. You can also display the pages of a single PDF as a slideshow.
In the Preview app on your Mac, open each file that you want in the slideshow.
If you open a single PDF, the pages of the PDF will be displayed in the slideshow.
Choose View > Slideshow.
Use the controls at the bottom of the screen to move from page to page or end the slideshow.