To activate this feature, check "Always Use Subtitles" in the Slide Show tab on the ribbon. Then, expand the "Subtitle ...

User friendly Just tell the AI PowerPoint generator what you’d like your presentation to be about to get started. For the best results, include the tone you want to use, how many slides you’d like, ...

It's not really Microsoft's fault. PowerPoint gives you all kinds of templates and graphics tools, but all anyone ever uses is boring bullet points on a white background.