This method works best for one-off situationswhen you want to show several images and are unlikely to show those same images together again.
Open the photos you want in your slide showand only those photos.
Press-and-hold the Shift key and click on the third screen mode icon at the bottom of the Toolbox (shown here). This will change all the images into Full Screen mode.
Press Tab to hide all floating palettes, then Control-Tab (both platforms) to change between images. You may have to use the Zoom In shortcut to make each image largerCommand+ (PC: Control+). To return to normal view, press Tab to show the palettes, and Shift-click on the Standard Screen mode icon (the far-left icon at the bottom of the Toolbox).