If PowerPoint Designer doesn't have any design ideas for you, there are a few possible reasons for that situation.
Don't see any PowerPoint Designer suggestions?
If there are no Design Ideas available for you, a few things might be the cause. First of all:
Make sure you're connected to the Internet. PowerPoint Designer goes online to get its Design Ideas.
Use a theme that comes with PowerPoint (not a custom theme or one that you've downloaded from elsewhere).
Following are other things you can do to troubleshoot.
No design ideas for slides with pictures?
Make sure your slide has either the Title or Title + Content slide layout applied.
Don't use any additional objects or shapes on the same slide as your photo.
Use a maximum of four photos (.jpg, .png, .gif, or .bmp) per slide, and make sure they're larger than 200 x 200 pixels in size.
No design ideas for process-based slides?
Make sure your slide has the Title + Content slide layout applied.
Don't use any additional photos, objects, or shapes on the same slide as your process text.
Because PowerPoint Designer is a relatively new service, it is still learning new tricks. If Designer can’t generate high-quality options for you, it won’t show any options at all. We're working hard to be able to generate great design ideas for more varieties of your content.
And of course, if you don’t find Designer useful, you can turn it off by going to File > Options > General, and then clearing the box that says Automatically show me design ideas.
Someone else is editing
If you are co-authoring a presentation with someone else and more than one person is actively editing a single slide at one time, Designer won't give design suggestions on that slide.
However, as soon as there's only person editing the slide, Designer will begin offering design suggestions again once that person does an action (such as adding a photo) that Designer can respond to.