Hello Sue Collins,
Just adding to the AI answer — there are a couple of simpler routes for running several folders as one slideshow that might suit you better:
- File Explorer is probably the quickest for a one-off. Open one folder, select the photos you want (or press Ctrl+A for all), then on the ribbon go to the Manage / Picture Tools tab > Slide show. You can repeat across folders, or copy/move the photos you want into a single temporary folder and run the slideshow once.
- Photos Legacy > Albums is the cleanest if you want it to stick. Open Photos Legacy, go to Albums > New album, then pick photos from across your different folders. Open the album and press F5 (or use the Slideshow button) to play them all in one go.
- In the current Photos app, after adding your folders via Gallery > Add folder, you can open any photo and press F5 to start the slideshow — but it plays from the current view, so it works best when all the photos are visible in one Gallery scroll.
If you let me know roughly how many folders/photos you're dealing with, I can point at the option that'll be least fiddly.
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