Android GUI designer doesn't successfully change app theme

The Android GUI designer in IntelliJ has a dropdown for selecting "Framework themes". The problem is, changing it has no effect on what shows up in the emulator when I test my app. No matter what is chosen, the app theme is always the default black Holo theme (Theme.Holo, I'm guessing.) I'd like it to be Theme.Holo.Light - but really it makes no difference which one I select.

Anyone have advice on making this work in the designer?

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