slide show

You have to add them manually to each slide in the slideshow.

Click on the ⊕ button at the right end of the slide tray and select Add Text for each slide.

There is another way to get a slideshow with titles but it's done with an AppleScript: Script: A Slideshow With Titles and Locations And Dates in Photos. You can edit the script to remove the locations and dates.

You're welcome.