Edit > Preferences > Appearance > Slide List
Change the default "Use Standard Text #" to "Use Name of Top Layer".
But, given the fact that a slide can contain any number of layers of all sorts, and not just one image, I'm not sure what you'll gain with this.
You CAN give the slide a name, any name, that you want. Right click on the slide in the slide list and chose Rename Slide. This makes more sense than giving the slide the name of the first layer.
You might like this option better. However, try the route Mona suggested and see what she and I mean ... then, see what you think of the alternative mentioned above.
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